JDY Performance BMW B58TU Downpipe - M240/M340/M440/A91 Supra

JDY Performance BMW B58TU Downpipe is a high-flow upgrade for factory-turbo B58 Gen 2 applications, designed to reduce exhaust restriction while retaining precise fitment and OEM mid-pipe compatibility.

Design and construction

• 304 stainless-steel cast and TIG-welded construction
• 4.5-inch high-flow turbo outlet
• Cast main section for smooth internal transitions and robust heat-cycle durability
• 89 mm internal-to-80 mm external outlet transition for factory-size mid-pipe connection
• Back-purged TIG welding

Configuration

• Catless version for competition/off-road use where legally permitted
• Catted version with a large 130 mm, 200-cell catalyst
• Left- and right-hand-drive-compatible versions according to the selected configuration

Fitment

Supported B58TU / B58 Gen 2 BMW M240i, M340i and M440i applications, plus the corresponding Toyota GR Supra platform. Confirm engine generation, drive side and catalyst requirements before ordering.

Professional installation and ECU calibration may be required. Exhaust-noise and emissions compliance remain the vehicle owner's responsibility.

Supplier

JDY Performance

Product System

• Exhaust
• Turbo & Forced Induction

Vehicle Fitment

• BMW 2 Series M240I G42 chassis
• BMW 340I M340I G20 G21 B58
• Toyota Supra A90 A91 B58

Confirm chassis, engine, drivetrain and production-year compatibility before ordering.

Available Options

Catalytic Converter

• Yes
• No

Supplier Part Numbers

B58-253-JDY-PA, B58-253-DWP-PA

Built by Boost & Tune Support

BBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.