DOC Race Top Mount Turbo Kit – Toyota GR Supra A90 / A91 (6-Port B58, 2021+)

OVERVIEW

The DOC Race top-mount single turbo kit for the 2021+ 6-port B58 GR Supra pairs a Precision Next Gen turbocharger with a stainless tubular T4 twin-scroll manifold, twin Turbosmart 45mm wastegates and a 3.5" stainless downpipe.

Choose the 1.25 Schedule 40 runner (known to support well over 1,200 hp, with an investment-cast collector) or the larger 1.5 Schedule 40 runner for lower exhaust back pressure.

SPECS

• Turbo options: PTE Next Gen 6466 / 6670 / 6870 / 6875 / 7275 ball bearing, or supply your own PTE turbo
• Runner options: 1.25 Sch 40 (1.66" OD) or 1.5 Sch 40 (1.90" OD)
• Stainless tubular T4 twin-scroll manifold
• 2 x Turbosmart 45mm wastegates with external dump tubes
• 3.5" stainless downpipe
• Exhaust parts supplied polished (ceramic coating is a separate DOC Race service)
• Precision (PTE) turbochargers only
• Built to order; approximately 4 weeks lead time
• The price shown on the "supply my own turbo" option does not include a turbocharger.

PARTS INCLUDED

• Precision turbocharger (unless "supply my own" is selected)
• 2 x Turbosmart 45mm wastegates
• Stainless tubular T4 twin-scroll manifold
• 3.5" stainless downpipe
• 2 x wastegate dump tubes
• 2 x charge pipes (turbo to throttle body)
• Silicone couplers and clamps
• Stainless oil drain, oil feed and coolant bypass line kits
• T4 gasket, turbo studs and nuts
• Exhaust V-band clamp
• 4" turbo screen
• Heat shield
• 1/4" nylon tubing and fittings for wastegate routing
• Valve cover vent filter
• 2 x 3/4" boost caps

TECH RESOURCES

Required Additional Parts

• Tuning (required): Bootmod3 GR Supra Tune, MHD Super License – GR Supra or JB4 Tuner – GR Supra.
• Supporting fueling sized for your power target, e.g. JB4 Fuel Pressure Upgrade Kit.

Installation

• DOC Race kit video: B58 top mount turbo kit.
• Wastegate vacuum lines must be routed away from exhaust heat; melted lines can cause over- or under-boost.
• DOC Race does not publish an installation manual for this kit. Contact Speed Logic for install support.

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