Spool B46/B48 Stainless-Steel Race Downpipe – BMW

Spool B46/B48 Stainless-Steel Race Downpipe is a BMW-specific exhaust upgrade with separate B46 and B48 fitment selections.

• Robotic TIG-welded stainless construction
• Optimized-radius bends
• RHD/LHD compatible
• Works with factory and compatible aftermarket cat-back systems

Select the correct engine: B46 or B48. VIN confirmation is recommended before ordering.

Road-use notice: race/off-road exhaust component. The purchaser is responsible for compliance with local emissions and road-use requirements.

Dispatch: Special order — allow 2–3 weeks.

Supplier

Spool Performance

Product System

• Exhaust
• Turbo & Forced Induction

Vehicle Fitment

• BMW 2 Series F22 B46 B48
• BMW 3 Series F30 B46 B48
• BMW 4 Series F32 B46 B48
• BMW 4 Series F33 B46 B48
• BMW 4 Series Gran Coupe F36 B46 B48
• BMW 5 Series G30 B48
• BMW X1 F48 B48
• BMW X2 F39 B48
• BMW X3 G01 B48
• BMW X4 G02 B48

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

Available Options

Engine

• B46
• B48

Supplier Part Numbers

SP-B46B48-DP-B46, SP-B46B48-DP-B48

Built by Boost & Tune Support

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