Building a Faster S2000 AP2: Realistic Power Targets and Component Costs

The Honda S2000 AP2 occupies a special place in the sports car pantheon. Its high-revving 2.2-liter engine, near-perfect 50:50 weight distribution, and raw hydraulic steering deliver a driving experience that modern cars often sanitize away. Yet even the most dedicated enthusiast occasionally craves more thrust. The stock AP2 delivers approximately 237–240 horsepower at the crank, which translates to roughly 200–210 horsepower at the rear wheels after drivetrain losses. That's genuinely enjoyable, but a properly planned upgrade can transform the car into something truly startling without sacrificing the reliability that makes the S2000 a viable daily driver or weekend toy.

This guide provides a detailed cost breakdown for upgrading your S2000 AP2 using components from Flyin' Miata and Manley Performance. While the headline figure of 220+ horsepower sounds modest, we are targeting 220+ wheel horsepower — a meaningful increase of roughly 10–15 percent over the stock output at the tires — and the same components discussed here are fully capable of supporting 350 to 450 wheel horsepower if you choose to turn up the boost later. Understanding what each part costs, why it matters, and how the pieces fit together will help you budget realistically and avoid expensive mistakes.

The AP2 F22C1 Engine: What You Are Working With

The AP2 S2000, produced from 2004 through 2009, uses the F22C1 engine. This 2.2-liter four-cylinder shares the same basic architecture as the earlier F20C but features a longer stroke (90.7 mm versus 84.0 mm) that increases displacement from 2.0 to 2.2 liters. The longer stroke gives the AP2 engine more low-end and mid-range torque compared to the high-strung AP1, making it more tractable for everyday driving and, critically, more responsive to forced induction.

Stock, the F22C1 revs to 8,200 rpm and produces 237–240 hp at the crank. At the rear wheels, expect 200–210 hp on a typical dynamometer. The engine is robust from the factory, with forged connecting rods, a forged crankshaft, and a stout cylinder block. However, the factory pistons are cast units that become a reliability concern above roughly 350 wheel horsepower. The factory fuel system also reaches its limit once you add meaningful boost. These limitations define the upgrade path: fuel system, engine internals, boost, and calibration.

Power Targets: Crank Horsepower versus Wheel Horsepower

Automotive marketing and enthusiast forums often blur the line between crank horsepower (bhp) and wheel horsepower (whp). Crank horsepower is what the engine produces at the flywheel, measured without the drag of the transmission, driveshaft, differential, and tires. Wheel horsepower is what actually reaches the pavement, and it is typically 12–15 percent lower on a rear-wheel-drive car like the S2000. A stock AP2 making 240 bhp will measure approximately 205 whp on a Dynojet dynamometer.

When we talk about reaching 220+ hp in this article, we are referring to wheel horsepower. That target represents a real-world, butt-dyno-noticeable improvement over stock and is achievable with modest modifications. The same hardware package, however, is engineered to support much higher outputs. The turbocharger kits, forged internals, and fuel system upgrades discussed here can comfortably support 350 to 450 whp if you upgrade the turbocharger or increase boost pressure later. Building for 220 whp gives you a reliable, street-friendly car with headroom to grow.

Component-by-Component Cost Breakdown

Every successful S2000 build starts with a clear understanding of what each component costs and why it is necessary. The sections below detail the major categories, the role each part plays, and the price range you should expect. Prices reflect current market rates as of early 2025 and include only the parts themselves unless otherwise noted. Installation labor, tuning, and supporting modifications are discussed separately.

Turbocharger Kit

A turbocharger kit is the most effective single modification for increasing horsepower on the F22C1. Unlike superchargers, which are also available for the S2000, turbochargers offer superior thermal efficiency, lower parasitic loss, and greater peak power potential. Flyin' Miata offers a comprehensive turbo kit for the S2000 AP2 that includes the turbocharger, exhaust manifold, downpipe, wastegate, blow-off valve, intercooler, intercooler piping, and all necessary hardware and hoses.

The kit is designed to bolt onto a stock engine with minimal fabrication, and it accommodates both the factory air conditioning and power steering systems — a detail that matters if you plan to street drive the car. The turbocharger itself is typically a Garrett or BorgWarner unit sized to spool quickly on the 2.2-liter engine, reaching full boost by approximately 3,500–4,000 rpm.

Cost range: $3,500–$6,000 depending on the specific turbocharger selection, wastegate options, and whether you choose a cast or tubular exhaust manifold. The complete Flyin' Miata kit with a cast manifold typically runs around $4,200–$4,800.

External resource: Flyin' Miata official website — check their S2000 section for current kit configurations and pricing.

Fuel System Upgrades

The stock S2000 AP2 fuel system was designed for naturally aspirated operation. Once you add positive manifold pressure, the factory fuel pump cannot maintain the required flow rate, and the factory fuel injectors run out of capacity well before you reach 300 wheel horsepower. Upgrading the fuel system is a non-negotiable safety item, not a performance option. A lean air-fuel mixture under boost can destroy an engine in seconds.

The minimum upgrade path includes a high-flow in-tank fuel pump (such as a DeatschWerks DW300c or Walbro 525), larger fuel injectors (typically 550–750 cc/min for a 300–400 whp target), and a fuel pressure regulator to maintain consistent rail pressure. Many builders also replace the fuel lines from the tank to the engine bay with larger-diameter hose to eliminate any restriction. Some kits include a return-style fuel rail and regulator as part of a complete package.

Cost range: $800–$1,500. A quality pump and injector set combined with a regulator and installation hardware typically lands around $1,000–$1,200. If you opt for a comprehensive return-style system with a billet fuel rail, expect to be at the upper end of the range.

Engine Internals: Pistons and Connecting Rods

The F22C1's factory cast pistons are the primary weak point when adding boost. They can tolerate moderate forced induction up to roughly 350 whp with a conservative tune, but any detonation event or aggressive timing will likely crack a ring land. For a build targeting 220+ whp with room to grow, or for anyone who plans to run sustained high boost, forged pistons and connecting rods from Manley Performance are the gold standard.

Manley offers a variety of piston configurations for the F22C1, including 9.0:1 and 9.5:1 compression ratios. Lower compression ratios allow more boost without detonation, making the 9.0:1 pistons a popular choice for turbo builds. The connecting rods are forged from 4340 chromoly steel, shot-peened, and magnafluxed for defect detection. They are significantly stronger than the factory rods and will handle 500+ whp without concern.

Installing forged pistons and rods requires completely disassembling the engine, machining the cylinder bores to accept the new pistons (typically a hone or bore to match the piston diameter), balancing the rotating assembly, and reassembling with new bearings, rings, and seals. The parts themselves are a fraction of the total cost; the labor and machine work make up the balance.

Cost range: $1,500–$3,000 for the piston and rod set alone. A complete rotating assembly with pistons, rings, wrist pins, rods, rod bolts, and main bearings typically costs $2,200–$2,800. Plan on an additional $1,000–$2,000 for machining and assembly labor.

External resource: Manley Performance official website — their product catalog includes specific piston and rod kits for the F22C1.

Engine Management and ECU Tuning

The stock S2000 ECU uses a closed-loop fuel and ignition strategy that cannot properly control a forced-induction engine. Running a turbocharged F22C1 on the factory calibration would result in dangerously lean mixtures and uncontrolled ignition timing. A standalone ECU or a piggyback tuning solution is mandatory.

Popular options for the S2000 include the Hondata FlashPro, which reflashes the factory ECU with a user-programmable calibration, and fully standalone systems such as the AEM Infinity or Haltech Elite series. FlashPro is more affordable and retains many factory features like variable valve timing control, but it has some limitations on very high horsepower builds. Standalone ECUs offer unlimited flexibility but require more expertise to tune and typically demand a custom wiring harness.

Professional dyno tuning by a shop experienced with the F22C1 is strongly recommended. A generic base map will get the engine started, but only a proper tune on a load-bearing dynamometer can optimize air-fuel ratios, ignition timing, and boost control for your specific combination of parts. A bad tune can destroy your forged pistons just as easily as it can destroy cast ones.

Cost range: $500–$1,200 for the tuning session and software licensing. Hondata FlashPro with a tune is typically $700–$1,000. A standalone ECU plus harness and tuning starts around $1,500–$2,500.

Exhaust System

A turbocharger changes the exhaust system requirements fundamentally. The turbo itself acts as a significant exhaust restriction and muffling device, so a free-flowing exhaust behind the turbo is important for minimizing backpressure and spool time. The stock S2000 exhaust system is restrictive, with a small-diameter intermediate pipe and a muffler designed for naturally aspirated operation.

A 3-inch diameter stainless steel exhaust system from the turbo downpipe back is a common choice for turbo S2000 builds. It should include a high-flow catalytic converter (if required for your local emissions regulations) and a muffler that controls noise without choking airflow. The exhaust system also affects boost response: too much restriction and the turbo spools slowly; too little and the car can be obnoxiously loud inside the cabin.

Full turbo-back exhaust systems for the S2000 range from simple 3-inch test pipes to complete cat-back systems with resonators and mufflers. Many builders choose to retain a catalytic converter to keep the car street-legal and reduce exhaust odor, but that adds cost.

Cost range: $600–$1,500. A quality 3-inch cat-back exhaust system without a catalytic converter typically costs $600–$900. Adding a high-flow catalytic converter adds $200–$400. A full turbo-back exhaust including the downpipe, intermediate pipe, and cat-back section can reach $1,200–$1,500.

Supporting Modifications and Incidentals

Beyond the major component categories above, several supporting items are necessary for a complete, reliable build:

  • Clutch and Flywheel: The stock clutch cannot hold much more than stock torque. A stage 2 or stage 3 organic clutch kit with a lightweight flywheel costs $400–$800. A heavy-duty clutch is essential for any car making over 300 whp.
  • Intercooler and Piping: Most turbo kits include an intercooler, but if you are piecing together your own system, budget $300–$600 for a bar-and-plate intercooler and silicone couplers.
  • Boost Controller: A manual boost controller ($30–$50) works reliably for fixed boost, while an electronic boost controller ($200–$400) allows in-cab boost adjustment and more precise control.
  • Oil Cooler and Oil System: Turbocharging increases oil temperatures. An oil cooler kit with a thermostat, lines, and a sandwich plate costs $300–$500. Upgraded oil pump gears are also recommended for sustained high-rpm use.
  • Ignition System: Colder spark plugs (one or two heat ranges colder than stock) are required for forced induction. A set of plugs costs $40–$80.
  • Cooling System: The stock radiator may be adequate for 300 whp on a street car, but a thicker aluminum radiator ($300–$500) provides a safety margin.

Cost range for supporting mods: $1,000–$2,500 depending on what you already have and what your power target dictates.

Complete Cost Estimation Table

The table below consolidates the cost ranges for each major component category. This represents the parts cost only, not including installation labor, machine work, or tuning.

  • Turbocharger Kit (Flyin' Miata): $3,500–$6,000
  • Fuel System Upgrades: $800–$1,500
  • Engine Internals (Manley pistons and rods): $1,500–$3,000
  • ECU Tuning (FlashPro or standalone + tune): $500–$1,200
  • Exhaust System (turbo-back): $600–$1,500
  • Supporting Modifications (clutch, cooling, etc.): $1,000–$2,500

Total parts-only range: $7,900–$15,700. The midpoint of approximately $11,800 represents a well-balanced build using mid-range components from reputable brands. If you choose to perform the engine internal work yourself and shop used parts carefully, you can reduce that number. If you opt for top-tier standalone ECUs, custom aluminum radiators, and billet fuel systems, you will be at the upper end or beyond.

Estimated total with professional installation and tuning: $12,000–$20,000, depending on labor rates in your area ($100–$175 per hour is typical for a specialized performance shop) and the extent of the engine machine work.

Installation Considerations: DIY Versus Professional Shop

The cost differential between a driveway build and a shop build is substantial, but the decision should be based on your mechanical experience, tool availability, and tolerance for downtime. A turbocharger kit installation, fuel system upgrade, and exhaust swap are within reach of a competent home mechanic with a basic socket set, jack stands, and a torque wrench. Expect to spend 20–40 hours of labor if you are methodical and have done similar work before.

Engine disassembly, machining, and reassembly for forged pistons and rods require specialized knowledge, precision measuring tools (micrometers, bore gauges, plastigauge), and access to a machine shop for cylinder honing, deck surfacing, and balancing. This is not a job for a first-time engine builder. If you have never built an engine before, budget for professional machine work and assembly, or plan to send the short block to a shop that specializes in Honda four-cylinders.

ECU tuning is another area where expertise matters. A skilled tuner familiar with the F22C1 and Honda's variable valve timing system can extract safe power while maintaining drivability. A beginner with a laptop and a base map can easily destroy a $5,000 engine in a few minutes of full-throttle operation. Pay the professional.

Reliability and Longevity: What to Expect After the Build

A properly executed S2000 turbo build with forged internals, a quality fuel system, and a conservative tune is exceptionally reliable. The F22C1 engine, even in modified form, can achieve 50,000 to 100,000 miles of daily-driven service if maintenance intervals are respected. Oil changes with a high-quality synthetic oil every 3,000–5,000 miles are critical, as turbocharged engines stress the oil more than naturally aspirated ones. Let the car idle for 30–60 seconds after a hard run to cool the turbocharger before shutting it off, or install a turbo timer to do it automatically.

The components that most commonly require attention on a turbo S2000 are the clutch (a performance clutch will wear faster than stock, especially with aggressive driving), the cooling system (radiator cap, hoses, and water pump should be refreshed every 3–4 years), and the turbocharger itself (a quality Garrett or BorgWarner unit typically lasts 60,000–80,000 miles before requiring a rebuild).

One often-overlooked detail is the differential. The stock S2000 differential is strong, but the axle stubs and differential bushings can wear with increased torque. Upgraded differential bushings ($100–$200) eliminate wheel hop and improve traction without adding NVH that ruins the car's character.

Not everyone needs to buy everything at once. A staged approach lets you spread the cost and enjoy incremental improvements while building toward your final target. Below is a recommended sequence based on experience with dozens of S2000 turbo builds.

Stage 1 — Bolt-Ons and Tune ($2,000–$3,500): Install a cold-air intake, a high-flow catalytic converter or test pipe, and a cat-back exhaust. Add a Hondata FlashPro tune for the naturally aspirated combination. This typically yields 220–230 whp on a healthy engine — already past your 220+ whp target with minimal investment. No internal engine work or fuel system changes are needed at this power level.

Stage 2 — Fuel System and Turbo Kit ($5,000–$8,500): Add the turbo kit, fuel pump, injectors, and a proper forced-induction tune. At moderate boost (6–8 psi), expect 280–330 whp. The factory cast pistons and rods will hold this power level on a conservative tune with good fuel and proper cooling. This is a popular stopping point for street cars that see occasional track use.

Stage 3 — Forged Internals and High Boost ($4,000–$7,000): Install Manley pistons and rods, upgrade the clutch, add an oil cooler, and turn the boost up to 12–15 psi. With the same turbocharger, this configuration produces 350–450 whp depending on the turbo size, fuel octane, and tuning. This build requires professional engine assembly and a standalone ECU for optimal control.

A staged approach also lets you correct any issues that emerge at lower power levels before you commit to the full build. A car that runs poorly at 280 whp will not magically run well at 400 whp — it will just break expensive parts more quickly.

Conclusion

Upgrading your Honda S2000 AP2 to 220+ wheel horsepower — and well beyond — is a rewarding project that transforms an already excellent sports car into a genuine performance machine. The cost breakdown presented here gives you a realistic picture of the investment required, with a total parts budget of roughly $8,000–$16,000 depending on your choices and how much work you perform yourself. Adding professional labor and tuning pushes the total to $12,000–$20,000.

Flyin' Miata provides well-engineered turbo kits that simplify the installation process, and Manley Performance supplies the forged engine internals needed for reliability at higher boost levels. Combining these components with a proper fuel system, exhaust, and professional ECU calibration yields a car that is both exhilarating and dependable. Whether you build in stages or commit to a full turbocharged forged-engine build from the start, understanding the costs upfront lets you plan your budget and avoid the most common pitfalls that derail S2000 projects.

With careful planning, quality parts, and disciplined tuning, your S2000 AP2 can deliver the kind of power and response that makes every drive an event — without sacrificing the character that made you buy the car in the first place.