The Toyota 86, along with its Subaru BRZ and Scion FR-S siblings, has earned a reputation as one of the most engaging sports cars of the modern era. Its lightweight chassis, near-perfect 50:50 weight distribution, and rear-wheel-drive layout offer a driving experience that belies its modest horsepower. Yet for many enthusiasts, the naturally aspirated 2.0-liter FA20 flat-four engine — producing roughly 200 hp from the factory — feels like it wants more. The goal of a reliable 100+ hp gain is ambitious but achievable, and Cosworth, a name synonymous with motorsport engineering, offers a suite of components designed to extract that extra power without sacrificing reliability. This article provides a detailed cost breakdown of upgrading your Toyota 86 for 100+ hp using Cosworth parts, exploring both the necessary components of a forced-induction build and the supporting modifications that ensure a successful outcome.

Understanding the Toyota 86's Potential

The FA20 engine is a unique platform. It combines a high compression ratio (12.5:1 in naturally aspirated form) with a boxer layout, which provides a low center of gravity but also presents challenges for forced induction. Achieving a reliable 100+ hp increase — from around 200 whp to over 300 whp — typically requires a turbocharger or supercharger. Cosworth’s expertise in high-performance engine components, honed through decades of Formula One and rally success, makes their parts a premium choice for this platform. Their intake manifolds, engine management systems, camshafts, exhausts, and complete turbocharger kits are engineered to complement each other, delivering a cohesive power band and durability under sustained use.

Why Cosworth?

Cosworth isn’t just a name in aftermarket performance; they are an OEM supplier to major automotive manufacturers and a staple in motorsport. For the Toyota 86, their parts are often viewed as the benchmark for quality and precision. Unlike generic “universal” turbo kits, Cosworth’s offerings are vehicle-specific, requiring minimal fabrication and using premium materials such as Inconel for exhaust components and high-grade aluminum for intake manifolds. While there are cheaper alternatives (such as kits from companies like GReddy or HKS), Cosworth’s engineering pedigree often translates to better fitment, more consistent tuning results, and higher resale value — but at a premium price. For owners serious about a 300+ whp build that retains daily drivability, Cosworth provides a clear path.

Overview of Key Cosworth Performance Parts

To reach 100+ hp, the most effective route is a turbocharger kit. However, supporting modifications such as fueling, engine management, and exhaust are also critical. Below are the key Cosworth parts commonly used in such builds.

Cosworth Intake Manifold

Cosworth’s intake manifold for the FA20 is designed to improve airflow and reduce intake air temperatures compared to the restrictive factory unit. It features larger plenum volume and smooth runners, which help maintain low-end torque while increasing top-end flow. On a turbocharged car, a good intake manifold reduces restriction before the throttle body, aiding spool and peak power. Estimated cost: $800

Cosworth Engine Management System (EMS)

The factory ECU is locked and not easily tunable for significant power increases. Cosworth’s standalone EMS (based on the Pectel SQ6 platform) allows full control over fuel, ignition, boost, and auxiliary functions. It includes a chassis harness designed to plug into the factory connectors, simplifying installation. With a base map from Cosworth, a professional tuner can dial in the perfect air-fuel ratios for a turbocharged FA20. Estimated cost: $1,200–$1,500

Cosworth High-Performance Camshafts

For forced induction, Cosworth offers camshafts with increased duration and lift, designed to optimize valve events for boost. These cams help move the power band higher while still maintaining good low-end response. They are made from billet steel and feature hardened lobes for longevity. Estimated cost: $900

Cosworth Exhaust System

A free-flowing exhaust is essential for both naturally aspirated and turbocharged builds. Cosworth’s cat-back system uses stainless steel construction and a TIG-welded muffler that reduces backpressure without being obnoxiously loud. For a turbo setup, an aftermarket downpipe (often included in the turbo kit) is equally important. Estimated cost: $1,000

Cosworth Turbocharger Kit

The centerpiece of the 100+ hp upgrade: Cosworth’s bolt-on turbo kit for the Toyota 86. It includes a Garrett GT28-series turbocharger (or similar), a cast stainless steel manifold, intercooler, blow-off valve, wastegate, and all necessary plumbing. This kit is designed to deliver approximately 300–350 whp on a stock internal engine (with proper fueling and tuning). It is well-known for its robust construction and straightforward installation. Estimated cost: $3,500

Comprehensive Cost Breakdown

The following table provides a realistic estimate for a complete Cosworth-based build targeting 100+ hp. Prices are in USD and may vary based on retailer and location.

Component Estimated Cost
Cosworth Turbocharger Kit$3,500
Cosworth Intake Manifold$800
Cosworth Engine Management System$1,200
Cosworth High-Performance Camshafts$900
Cosworth Exhaust System$1,000
Total Parts$7,400
Labor (estimated 20-25 hours at $75/hr)$1,500
Professional ECU Tune (dyno time + calibration)$800
Fuel System Upgrades (injectors + pump + lines)$600
Oil Cooler (mandatory for turbo)$400
Clutch Upgrade (to handle torque)$500
Miscellaneous (gaskets, fluids, hardware)$200
Total Estimated Build Cost$11,400

Note: The above includes essential supporting modifications that are often overlooked. The turbo kit alone will not yield 100+ hp reliably without proper fueling, cooling, and a clutch upgrade.

Hidden Costs and Considerations

Beyond the initial parts and labor, several factors affect the total cost of ownership for a heavily modified Toyota 86.

Maintenance Frequency

Forced induction increases thermal and mechanical stress. Oil change intervals should be halved (every 3,000–4,000 miles with high-quality synthetic oil). Spark plugs may need replacement every 20,000 miles instead of 60,000. The turbo itself may require a rebuild after 60,000–80,000 miles of hard use. Budget an extra $200–$400 annually for consumables.

Insurance Premiums

Modifications that increase horsepower by 50% or more will likely raise your insurance premiums. Many standard insurers either refuse coverage or apply a significant surcharge. Specialist insurers like Hagerty or Grundy offer agreed-value policies for modified cars but require a separate appraisal. Expect to pay 20–50% more per year, depending on your driving record and location.

Resale Value

A well-documented, professionally installed Cosworth build can actually enhance resale value among a small pool of enthusiastic buyers. However, the broader market is wary of modified cars. If you plan to sell, retaining original parts and being transparent with receipts is critical. Many owners find they recoup only 40–60% of the modification cost at resale.

In regions with strict emissions testing (California, New York, Europe), a Cosworth EMS and turbo kit will likely cause the car to fail a visual or tailpipe inspection. Some owners choose to install a “test pipe” for the track and swap back for inspection, adding labor costs. Alternatively, consider a CARB-legal supercharger kit from a different brand if street legality is a primary concern.

Sample Build Scenarios

To illustrate different budget levels, here are three common paths to achieving 100+ hp in a Toyota 86 using Cosworth components.

Budget Turbo Build (~$10,000)

Use only the Cosworth turbo kit, a basic EMS (or a piggyback like the oft-used Delicious Tuning Flex Fuel kit), and stock camshafts. Skip the intake manifold and use the factory unit. Expect around 300–320 whp with a conservative tune. This path saves about $1,700 on parts but sacrifices some top-end power and tuning flexibility. Reliability is still good, but the stock camshafts may limit performance at high RPM.

Full Cosworth Build (~$11,400)

As outlined in the table above, all five Cosworth parts are installed along with necessary supporting mods. This yields about 350–380 whp on pump gas (91/93 octane), with a broad power band and excellent drivability. This is the recommended approach for those who want a cohesive, show-quality engine bay and maximum reliability.

Cosworth Turbo + Internal Engine ($16,000+)

For those seeking more than 400 whp, the FA20’s stock internals become a liability. A forged short block (pistons, rods, bearings) from Cosworth or a partner like Outfront Motorsports adds $3,000–$5,000. With the full Cosworth bolt-on kit plus cams, head work, and a larger turbo, power can exceed 500 whp. However, this path doubles the labor and requires constant maintenance. It is best suited for track use or show cars, not daily driving.

Final Budget Recommendations

Before writing a check, consider these steps to avoid surprises.

  • Get a detailed quote from a verified tuner — Contact a shop experienced with FA20 builds (such as CounterSpace Garage or Evans Tuning) for a custom estimate that includes labor, tuning, and dyno time.
  • Check for package deals — Cosworth occasionally bundles the turbo kit with a free EMS or discounted cams. FT86club.com forums often have group buy pricing.
  • Set aside a 10–15% contingency fund — Unexpected costs like a blown clutch in the first 1,000 miles or a needed oil pan baffle for high-g cornering can arise. Add $1,500–$2,000 to your budget.
  • Plan for downtime — A full build may take 2–4 weeks, depending on parts availability and shop schedule. Arrange alternative transportation.

Achieving a reliable 100+ hp increase in a Toyota 86 with Cosworth parts is not cheap, but it is one of the most thoroughly engineered paths available. For the enthusiast who values quality, fitment, and documentable peak power, the investment of roughly $11,000 to $12,000 (including labor and supporting mods) will transform the car into a true corner-carver that can also compete with modern muscle cars in a straight line. By understanding the full cost breakdown — not just the parts but also the tuning, fuel system upgrades, and ongoing maintenance — you can proceed with confidence, ensuring that your upgraded 86 remains both exhilarating and dependable for years to come.