BMW B46 & B48 Spool Stainless Steel Race Downpipe

The Spool B46/B48 race downpipe is one of the best value upgrades for turbocharged BMW 30i models, cutting backpressure for faster boost and more power with a tune.

Why you need it

Reducing backpressure helps the turbo build boost more efficiently and eases the load on it. With a proper tune, expect gains of 18–23 hp and a more aggressive exhaust sound. It works with the stock cat-back and with aftermarket exhausts.

Fits

• BMW 230i and xDrive (2016–2024)
• BMW 320i, 330i and xDrive (2016–2024)
• BMW 430i and xDrive (2016–2024)
• BMW 530i and xDrive (2017–2024)
• BMW X1 sDrive28i / xDrive28i (2016–2024)
• BMW X2 sDrive28i / xDrive28i (2018–2024)
• BMW X3 sDrive30i / xDrive30i (2018–2024)
• BMW X4 xDrive30i (2018–2024)

Features

• Robotic TIG welding in an argon chamber for consistent welds
• Smooth radius bends for better flow and turbo efficiency
• Fits LHD and RHD models with no modification
• Works with the stock cat-back and aftermarket systems
• 18–23 hp gains with a proper tune

Good to know

Choose the B46 or B48 version at checkout. Many US owners assume they have a B48, but US-market 30i models use the B46, so confirm your engine with your VIN before ordering. A tune is needed to see the power gains. This downpipe replaces emissions-related equipment. Intended for off-road and competition use only. Not legal for use on public roads in many areas. Professional installation is recommended.