B58 4.5" Heatshield Catless Downpipe - BMW B58 Series

Upgrade your BMW B58 with our premium 4.5" stainless steel downpipe, available in both race and high-flow catted versions for maximum performance and value.

Replacing the restrictive factory downpipe with either our catless race version or 200-cell high-flow catalytic converter dramatically reduces exhaust backpressure. The result is quicker turbo spool, increased horsepower, improved throttle response, and a deeper, more aggressive exhaust sound.

Constructed from hand-fabricated, TIG-welded 304 stainless steel, this downpipe features a full 4.5-inch design and a precision CNC-machined 304 stainless steel turbo flange for a smooth transition from the turbocharger to the mid-pipe. Every downpipe is built for exceptional durability, precise fitment, and long-lasting performance.

The race version includes a lifetime warranty, while the catted version is backed by a two-year warranty on the catalytic converter. All models are covered by our hassle-free fitment guarantee.

Features

• Handcrafted, TIG-welded 4.5" 304 stainless steel construction

• Available in catless race or 200-cell high-flow catted configurations

• CNC-machined 304 stainless steel turbo flange for optimal exhaust flow

• Reduces backpressure for faster turbo response and increased performance

• Produces a deeper, more aggressive exhaust tone

• Smooth mandrel bends minimize turbulence and maximize exhaust flow

• Compatible with both factory and aftermarket cat-back exhaust systems

• Direct bolt-on installation for both left-hand-drive (LHD) and right-hand-drive (RHD) vehicles

• Power gains of up to 25–30 HP with supporting tuning

• Lifetime warranty on the race version

• Two-year catalytic converter warranty on the catted version

Vehicle Compatibility

• 2019–2023 BMW G20, G22 & G26 B58 M340i, M440i & xDrive

• 2019–2022 BMW F22 B58 M240i & xDrive

• 2021–2023 BMW G42 B58 M240i & xDrive

• 2019–2023 BMW G05 B58 X5 40i & xDrive

• 2019–2023 BMW G29 B58 Z4 M40i