A90 Supra B58: Real Costs for 500, 600, and 700 Horsepower

The A90 Toyota Supra, powered by BMW’s B58 engine, has become a darling of the tuning world. Its closed-deck block, robust crankshaft, and efficient twin-scroll turbocharger provide a strong foundation for serious power gains. Enthusiasts often ask: what does it actually cost to hit 500, 600, or even 700 wheel horsepower (whp)? The answer isn't as simple as summing part prices, because supporting modifications, labor, and tuning calibration all eat into the budget. This breakdown gives you a realistic, itemized look at what it takes to reach each power level, with ballpark figures based on current market prices and real-world builds. Prices assume you are paying a professional shop for installation and tuning.

Understanding the A90 Supra B58 Engine

The B58 is a 3.0-liter inline-six turbocharged engine that first appeared in BMW’s F30 340i and later found its way into the Supra and Toyota GR’s lineup. It features a plasma-coated cylinder wall, a high-pressure direct injection system, and a lightweight closed-deck block. The twin-scroll turbocharger delivers responsive boost from low RPMs. Stock, the A90 Supra puts down around 335 to 400 wheel horsepower depending on fuel and dyno, but the engine is capable of much more. The key is understanding which parts become limiting as power climbs.

At 500 whp, the B58 handles the load with mostly bolt-on parts and a tune. At 600 whp, the factory turbocharger runs out of steam, and fueling demands increase. At 700 whp, you are pushing the stock engine internals to their limit, and an upgraded fuel system becomes mandatory. The costs scale non-linearly because each threshold requires more invasive modifications. Below, we break down each level with part-by-part estimates.

Bolt-On Basics: Common Modifications for All Levels

Before we dive into specific horsepower targets, it's helpful to understand the common categories of modifications that appear across all levels. The following parts are often the first purchases for any Supra tuning build:

ECU Tuning Software

A custom ECU tune is the single most impactful modification. Options include piggyback units (like JB4) or full flash tuning via BootMod3, MHD, or ECUtek. A tune alone can gain 50-80 whp on a stock car. Prices range from $500 for a remote flash tune to $1,200 for a custom dyno tune. Higher power levels often require a full stand-alone or an unlocked DME (Digital Motor Electronics), adding to the cost.

Downpipe

Replacing the restrictive factory downpipe (catalytic converter) with a high-flow cat or catless downpipe is essential for freeing exhaust flow. A catted downpipe costs $600–$1,000; a catless version is $400–$700. Both require a tune to avoid check engine lights.

Intercooler Upgrade

The factory intercooler heat soaks quickly under sustained load. An upgraded front-mount intercooler reduces intake air temperatures and allows consistent power. Good options from CTS Turbo, Evolution Racewerks, or CSF range from $700 to $1,500. This part becomes mandatory above 500 whp.

Intake System

A high-flow intake (open-element or enclosed) can reduce airflow restriction. A quality intake costs $300–$700. While not strictly required for 500 whp, it helps at higher levels.

Exhaust System

A full cat-back exhaust reduces backpressure and adds a sportier note. Prices range from $1,000 to $2,500. Many owners start with a downpipe and keep the stock cat-back for 500 whp, but a free-flowing exhaust becomes necessary as power climbs.

Cost Breakdown for 500 Wheel Horsepower

Reaching 500 whp on the A90 Supra is achievable with a well-chosen set of bolt-on modifications and a custom tune. The factory turbocharger, direct injection, and fueling system can still handle this power level on pump gas (93 octane). Below are estimated costs for parts and labor. It is strongly recommended to use a reputable tuner like ECUtek or BootMod3 for reliable results.

ComponentPart CostInstallation (est.)
Custom ECU Tune (dyno)$1,200 – $1,800Included in tune price
High-Flow Downpipe (catted)$700 – $1,000$250 – $400
Upgraded Intercooler$800 – $1,200$300 – $500
Cold Air Intake$350 – $600$100 – $200
Cat-Back Exhaust$1,200 – $2,000$200 – $400
Spark Plugs (one step colder)$80 – $120$100 – $150
Total Parts & Labor$4,730 – $7,070

At 500 whp, you do not need to upgrade the turbocharger or fuel system. Many owners also keep the stock exhaust and only swap the downpipe. This can reduce the total to around $3,500. However, for a reliable setup that maintains power on hot days, the intercooler and spark plugs are non-negotiable. Expect the car to feel aggressive but still daily-drivable.

Tips for the 500 whp Budget Build

  • Consider a flash tune over a piggyback; flash tunes offer more precise control.
  • If you plan to run E85 later, a flex-fuel sensor kit ($300–$500) allows the tune to adjust for ethanol content.
  • Use high-quality 93 octane pump gas and avoid aggressive timing on cheap fuel.

Cost Breakdown for 600 Wheel Horsepower

Breaking the 600 whp barrier requires a larger turbocharger. The factory twin-scroll unit simply cannot flow enough air beyond about 550 whp. An upgraded turbocharger, such as a Pure Stage 2, Precision 6062, or Garrett G25-660, becomes necessary. You will also need an upgraded fuel system to support the additional air. The stock high-pressure fuel pump (HPFP) and low-pressure pump (LPFP) max out around 600 whp on pump gas. Many shops recommend a full port injection system or a secondary fuel rail.

Additionally, the stock engine internals (pistons, rods) can handle 600 whp with a conservative tune, but you are approaching the limit. Reliability at this level depends heavily on the tuner's skill and the quality of parts. Below is an estimated cost breakdown.

ComponentPart CostInstallation (est.)
Custom ECU Tune (dyno) w/ flex fuel$1,500 – $2,000Included
Upgraded Turbocharger (e.g., Pure Stage 2)$3,500 – $5,500$800 – $1,200
High-Flow Downpipe (catless)$400 – $700$250 – $400
Upgraded Intercooler$1,000 – $1,500$300 – $500
Cat-Back Exhaust$1,500 – $2,500$200 – $400
Cold Air Intake$350 – $600$100 – $200
Fuel System Upgrades (HPFP + LPFP or port injection)$1,500 – $3,000$500 – $800
Spark Plugs (one step colder)$80 – $120$100 – $150
Total Parts & Labor$10,530 – $16,470

While you can run 600 whp on pump gas, most builders prefer E85 to keep cylinder pressures safe. E85 requires the fuel system upgrades listed. Without ethanol, you may push the knock limit and risk detonation. Do not skip the fuel system – lean conditions destroy engines.

Considerations at 600 whp

  • Upgrading the charge pipe and blow-off valve ($300–$600) is recommended because the factory plastic charge pipe can crack.
  • A boost controller (e.g., Mac valve) helps with fine-tuning boost curves. Add $200–$400.
  • Consider a catch can or oil separator to reduce carbon buildup on intake valves.
  • Transmission cooling: the ZF8HP automatic may benefit from an upgraded transmission cooler or an aftermarket tune for shift pressure.

At this power level, you will notice the car becoming less forgiving. Clutch packs in the automatic may slip with aggressive launches. The stock differential mounts and axles may also show flex. Budget for additional chassis bracing if you plan to track the car.

Cost Breakdown for 700 Wheel Horsepower

700 whp is where the Supra B58 truly transforms into a serious performance machine. This power level forces you to address nearly every weak point in the stock drivetrain. The stock turbo is long gone; a large single-scroll turbo, such as a Precision 6466, Garrett G35-900, or BorgWarner EFR 9180, is required. The factory fuel system will be overwhelmed, necessitating a full aftermarket return-style system with larger injectors, a surge tank, and dual or triple fuel pumps. You will also need upgraded engine internals: forged pistons and connecting rods to handle the cylinder pressure and heat. Some builders also opt for head studs, a billet main cap, and a timing chain upgrade.

Additionally, the ZF8HP automatic transmission usually needs a rebuild with upgraded clutches and a higher capacity valve body to survive repeated 700+ whp launches. The rear differential often requires a clutch-type limited-slip differential (if not already equipped) and stronger axles. Below is a representative breakdown, though prices vary heavily depending on part brand and labor rates.

ComponentPart CostInstallation (est.)
Custom ECU Tune (dyno) w/ flex fuel$1,800 – $2,500Included
Large Single Turbo Kit (manifold, turbo, wastegate, downpipe)$5,500 – $8,000$1,200 – $2,000
Full Return-Style Fuel System (fuel cell, pumps, lines, injectors)$3,500 – $5,500$1,000 – $1,500
Upgraded Intercooler$1,200 – $2,000$300 – $500
Cat-Back Exhaust$1,500 – $2,500$200 – $400
Forged Pistons + Connecting Rods$2,500 – $4,000$2,000 – $3,000 (engine removal required)
Head Studs + Gasket Set$500 – $800Included in engine labor
Transmission Build (clutches, valve body, cooler)$3,000 – $5,000$1,000 – $1,500
Differential + Axles (upgraded LSD, stronger axles)$2,000 – $4,000$500 – $1,000
Total Parts & Labor$23,500 – $37,700

Do not be surprised if the final cost exceeds $35,000 when you include ancillary items like an upgraded radiator, oil cooler, boost controller, gauges, and custom driveshaft. At this power level, building a reliable car requires meticulous engineering. Many owners report spending closer to $40k–$50k once all the small bits and labor are accounted for.

Reliability at 700 whp

  • Engine bay temperatures become extreme. Oil cooling and water cooling upgrades are essential.
  • Consider a standalone ECU for complete control over all parameters. This adds $2,000–$4,000 but allows better safety strategies.
  • Use a wideband oxygen sensor and a real-time data logging system to monitor air-fuel ratios and knock.
  • Budget for regular maintenance: oil changes every 3,000 miles, spark plugs every 5,000 miles, and transmission fluid services.

Many enthusiasts at this power level also upgrade the brake system with larger rotors and multi-piston calipers. The stock brakes can handle brief street pulls, but repeated high-speed stops on a track will cause fade. That adds another $2,000–$4,000.

Hidden Costs and Important Considerations

Beyond the parts and labor listed above, several hidden costs can inflate your total budget. Awareness of these prevents unpleasant surprises.

Labor Rates

Labor costs vary by region. Top-tier shops that specialize in B58 builds charge $125–$200 per hour. An engine build alone can take 20–30 hours. A turbo swap might take 8–12 hours. Factor 20–30% more on labor for complex builds.

Dyno Tuning Sessions

A full day of dyno tuning can cost $800–$1,500. If you change fuels (e.g., 93 octane to E85) or add modifications later, you will need additional tuning sessions. Budget for at least two sessions for a 600+ whp build.

Supporting Mods That Add Up

  • Oil Catch Can: $150–$300
  • Methanol Injection Kit (optional for 700 whp): $600–$1,200
  • Upgraded Charge Pipe: $300–$500
  • Boost Controller + Solenoid: $300–$500
  • Gauges (boost, oil pressure, oil temp): $300–$1,000
  • Wheels and Tires: $2,000–$4,000 for a set of sticky 200TW tires and lightweight wheels

Potential Pitfalls

High horsepower builds on the B58 have reported issues with the valve cover cracking under high boost, the plastic coolant pipes leaking, and the factory oil pump chain tensioner failing. Many builders replace these with billet aluminum parts early. Add another $500–$1,500 for these upgrades.

Comparing Power Levels: Which Is Right for You?

The choice between 500, 600, or 700 whp depends on your goals, budget, and willingness to accept reduced reliability. A 500 whp Supra remains a comfortable daily driver with good fuel economy when driven gently. You can still use the car for road trips or commuting. The 600 whp level gives you serious track-day capabilities but demands more maintenance and careful driving to avoid breaking parts. The 700 whp level is essentially a race car that requires constant attention, premium fuel, and a larger maintenance budget. Many owners find that 600 whp strikes the best balance between performance and livability.

For more insights, check out the SupraMkV forum for build threads and real-world owner experiences. Another excellent resource is Tuned by JT for comprehensive guides and dyno charts. Finally, the Engineered Motosports site has detailed technical articles on the B58’s limits.

Final Thoughts on Budgeting for A90 Supra Horsepower

Costs for reaching 500, 600, and 700 whp on the A90 Supra B58 follow an exponential curve. The initial jump from stock to 500 whp is relatively affordable if you stick to bolt-ons. Getting to 600 whp requires a turbo upgrade and fuel system, doubling or tripling the total. The leap to 700 whp involves engine internals, a full fuel system, and drivetrain reinforcement, making it a five-figure investment. Whatever target you choose, invest in a quality tuner who understands the B58 platform and uses premium parts. Cutting corners on cheap turbos or relying on overly aggressive tunes will cost far more in the long run when an engine rebuild becomes necessary.

Plan your build step by step, enjoy the process, and always set aside a contingency fund for the unexpected. A well-built 600–700 whp Supra is an incredible machine that rewards careful engineering. Whether you aim for 500 or pass 700, understanding the costs beforehand ensures you enjoy the journey without financial surprises.