A90 A91 Supra B58 Turbo Kit

2021 A90 A91 6-Port Supra B58 Top Mount Turbo Kit

The Doc Race Top Mount Turbo Kit for the 2021+ Toyota A90/A91 Supra with 6-port B58 engines is engineered for serious street and track builds targeting high boost and elite-level power. Now available in two runner sizes (1.25" and 1.5" Schedule 40), this kit offers the flexibility to meet your horsepower goals—whether you’re aiming for 800whp or breaking into the 1200+ HP range.

• The 1.25” schedule 40 manifold features a high-flow investment cast collector and is the standard for big power and proven reliability.
• The 1.5” runner version delivers reduced backpressure and more headroom for aggressive builds, without adding lag—contrary to common misconception.

This top-mount kit is exclusively designed for Precision Turbo turbos and includes everything you need for a full installation, including dual Turbosmart 45mm wastegates, stainless downpipe and dump tubes, oil and coolant lines, and heat shielding. Routing the included vacuum tubing correctly is essential for reliable operation—care must be taken to keep vacuum lines away from exhaust heat.

Important Fitment Note: This kit is Precision Turbo specific. Do not attempt to adapt with other turbos—fitment will be compromised.
Built to order. Average lead time is 4-6 weeks.

Kit Includes:

• Tubular stainless manifold (1.25" or 1.5” Schedule 40)
• Precision Turbo-compatible top mount T4 flange
• 2x Turbosmart 45mm wastegates
• 3.5” stainless steel downpipe
• Dual wastegate dump tubes
• Charge pipes (turbo to throttle body)
• Silicone couplers, clamps
• Stainless oil feed, drain, and coolant bypass lines
• Turbo studs, nuts, T4 gasket
• Exhaust V-band clamp
• 4” turbo screen
• Heat shield
• Vacuum tubing and fittings
• Valve cover vent filter + 2x ¾” boost caps