The A90 Toyota Supra, powered by the BMW-derived B58 engine, has rapidly become one of the most popular platforms for high-horsepower builds. With a robust closed-deck block and a well-designed cylinder head, the B58 can reliably support 650 wheel horsepower with the right combination of turbo upgrades, fuel system improvements, and ECU tuning. However, achieving that figure requires careful budgeting and component selection. This expanded guide breaks down every cost you can expect, from the turbocharger itself to the supporting hardware that keeps the engine happy at elevated power levels.

Understanding the B58 Engine and Its Potential

The B58 is a 3.0-liter inline-six that uses a twin-scroll single turbocharger, direct injection, and variable valve timing. In the A90 Supra, it produces 335 horsepower and 365 lb-ft of torque from the factory. The engine’s closed-deck construction and forged steel crankshaft give it an excellent foundation for modification. Many tuners have pushed the stock turbo to around 450–480 wheel horsepower with just software and exhaust, but hitting 650 wheel horsepower requires a larger turbo, upgraded fuel system, and comprehensive cooling.

Before you begin, it’s critical to understand the platform’s weak points. The stock fuel system — specifically the high-pressure fuel pump — becomes a bottleneck above 550–580 whp on pump gasoline. Similarly, the stock intercooler heat soaks quickly during repeated pulls, and the charge pipes can blow off under higher boost. Budgeting for these supporting components is just as important as the turbo and tuning itself.

The 650 HP Goal – What It Takes

Reaching 650 wheel horsepower (whp) on a B58 Supra typically requires a hybrid or full-frame turbo upgrade, a custom ECU tune (often with flex fuel capability), and a suite of supporting modifications. The exact cost depends heavily on whether you choose a budget “DIY” approach with a hybrid turbo and off-the-shelf tune or a premium build with a billet-wheel turbo, a full exhaust system, and methanol injection.

Turbocharger Upgrades

The turbo is the single most expensive component. Options range from stock turbo hybrid upgrades to large single turbo kits.

  • Stock Turbo Hybrid Upgrade: A hybrid turbo uses the stock frame but with a larger compressor wheel and sometimes a billet wheel. Examples include the Pure Turbo B58 Stage 2 or the Vargas GC+. These typically support 600–650 whp on ethanol and cost between $1,500 and $2,800.
  • Full Aftermarket Turbo Kit: A true big turbo, such as the Precision 6266 or the Garrett G35-900, requires an upgraded manifold, downpipe, and in some cases a new charge pipe setup. These kits cost $3,000 to $6,000 and are capable of 700+ whp.
  • Installation Costs: Installing a hybrid turbo is a weekend job for a skilled DIYer, but a full turbo kit often requires professional fabrication. Expect $500 to $1,500 for shop labor.

ECU Tuning Options

The ECU must be reprogrammed to take full advantage of the extra airflow. The two dominant tuning platforms for the B58 are Bootmod3 (BM3) and MHD.

  • Off-the-Shelf (OTS) Tune: A flash tune from BM3 or MHD for a specific turbo and fuel type costs $500 to $800. These are a good starting point but often leave power on the table.
  • Custom Remote Tune: A tuner will send you custom calibrations via email after reviewing datalogs. This costs $800 to $1,200 and is highly recommended for 650 hp to ensure safety and performance.
  • Dyno Tuning: A full day on a chassis dynamometer with a professional tuner runs $1,200 to $2,000. This is the most thorough way to dial in timing, boost, and fueling.
  • Flex Fuel Ethanol Tune: If you plan to run E85, you’ll need a flex fuel sensor and a tune that adjusts on the fly. The sensor kit adds $200 to $400, and the tune may be an additional $200 over the base price.

Supporting Mods – The Critical Foundation

Without proper supporting hardware, even the best turbo and tune won’t make safe, repeatable 650 hp. Below are the essential upgrades and their costs.

  • Intercooler: A high-flow stepped core intercooler is mandatory. Popular choices include Wagner Tuning, CSF, or do88. Expect to pay $800 to $1,500.
  • Intake System: A cold air intake frees up airflow and reduces restriction. Prices range from $300 for a simple dry filter to $600 for a carbon fiber setup.
  • Downpipe: A high-flow catted downpipe reduces backpressure and helps spool. Catted versions cost $400 to $700; catless versions are cheaper but illegal in many states. Adding a full cat-back exhaust costs $1,200 to $2,500.
  • Charge Pipes: Stock plastic charge pipes are prone to cracking under higher boost. Upgraded aluminum charge pipes cost $300 to $600 for a set.
  • Fuel System Upgrades: At 650 whp on pump gas, you’ll need larger fuel injectors (port injection or direct injection). A direct injection upgrade, such as the XDI-35 HPFP plus injectors, can run $1,500 to $2,500. Alternatively, a port-injection kit costs $1,200 to $2,000 plus labor.
  • Heat Management: A larger auxiliary radiator or an oil cooler upgrade is wise for track use. Budget $400 to $1,000 for extra cooling.

Detailed Cost Breakdown

The following table outlines a realistic range for each major category. Note that prices are for parts only; labor is separate.

  • Turbo Upgrade: $1,500 – $6,000
  • ECU Tuning (including flex fuel): $700 – $2,400
  • Intercooler: $800 – $1,500
  • Intake: $300 – $600
  • Downpipe + Cat-Back Exhaust: $1,600 – $3,200
  • Charge Pipes: $300 – $600
  • Fuel System Upgrades: $1,500 – $2,500
  • Cooling/Heat Management: $400 – $1,000
  • Installation Labor (estimate): $1,000 – $3,000

Total parts-only estimate: $6,100 – $17,800 (excluding labor). If you pay for all installation labor, the total can reach $8,000 to $21,000. Many builders find a sweet spot around $10,000 to $14,000 for a reliable, well-tuned 650 whp Supra using a hybrid turbo and E85.

Sample Build Paths

Budget Build: Hybrid Turbo + OTS Tune

This path uses a budget-friendly hybrid turbo (Pure Stage 2 or equivalent), an off-the-shelf flex-fuel tune, and minimal supporting mods. You can skip the full exhaust and use only a downpipe and stock or upgraded intake. Total cost: $7,000 – $9,000 (DIY install). This will comfortably hit 600–650 whp on E85 but may lack top-end punch compared to a bigger turbo.

Premium Build: Pure Big Turbo Kit + Custom Dyno Tune

With a full frame turbo, a high-end intercooler, port injection, and a pro dyno tune, you’ll achieve 650 whp on pump gas and over 700 whp on ethanol. Include a full exhaust and upgraded charge pipes. Total cost: $15,000 – $20,000. This setup delivers stronger mid-range and superior reliability for track use.

Additional Costs to Factor

Beyond parts and labor, several hidden expenses can affect your budget.

  • Maintenance: Higher power increases strain on spark plugs, coils, and oil. Budget for more frequent fluid changes and a set of colder spark plugs ($50 – $100).
  • Dyno Tuning Time: Even a remote tune often requires a dyno session for verification, costing $300 – $600 for rental time.
  • Insurance Premiums: Notify your insurer of modifications. Premiums can rise $200 – $800 per year depending on the declared power level.
  • Clutch or Transmission Upgrades: If your Supra is a manual swap or if the automatic transmission shows signs of slippage, a built transmission can cost $3,000 – $6,000. Most automatic A90s hold 650 whp fine with a good tune.
  • Data Logging Hardware: You’ll need a laptop and an OBD cable for remote tuning. Budget $100 – $200 for that.

Final Thoughts and Recommendations

Building a 650 hp A90 Supra on the B58 is a rewarding project, but it demands a realistic budget and component synergy. The most common mistake is focusing too much on the turbo and neglecting the fuel system or intercooler. A car that hits 650 hp once but then pulls timing due to heat or fuel starvation is not a successful build.

Strongly consider starting with the supporting mods: intercooler, downpipe, charge pipes, and intake, plus a stage 1 tune. This gets you to 450–480 whp and lets you learn the platform. Then add a hybrid turbo and fueling upgrades when you’re ready for 650 whp. A phased approach spreads out the cost and allows you to verify each component’s reliability.

For further reading and real-world build examples, check out the following resources:

With careful planning and a focus on quality components, your A90 Supra can safely and consistently deliver 650 wheel horsepower — and do so for years of enjoyable driving.