IBOAUTO
B58 Gen 2 Catless Downpipe (G20 M340i / Z4 G29)
Downpipe
$379.00
FitsB58
Off-road / competition use only
This part removes factory emissions equipment. It is not legal for use on vehicles driven on public roads and is sold only for off-road, racing and closed-course competition use. You are responsible for following the emissions laws where the vehicle is used. Read more
A 4.5" catless downpipe for the Gen 2 B58 in the G20 M340i and G29 Z4 M40i. It replaces the factory downpipe and its catalytic converter with a straight-through 304 stainless pipe, so the turbo spools sooner and the car makes more power once it's tuned. A heat shield wraps the pipe to keep exhaust heat away from nearby parts.
- 4.5" 304 stainless, 1.5 mm wall
- Straight-through, no catalytic converter
- Heat shield included
- Bolt-on, no cutting or welding
Fits
- BMW G20 G21 M340i (2019+)
- BMW G29 Z4 M40i (2019+)
- G22 M440i, G42 M240i and Supra A90: ask us before ordering
- Not for cars with an OPF/GPF
- Confirm fitment with your VIN before ordering
Specs
- Emissions
- Catless (off-road / competition use only)
- Tune
- Tune required
- Diameter
- 4.5 in
- Material
- 304 stainless steel, 1.5 mm wall
- Finish
- Smooth
- Heat shield
- Yes
What's included
- Downpipe with heat shield
Install
- Bolt-on, no cutting or welding
- Reuses factory O2 sensors
- Requires a tune that supports catless downpipes, or the check engine light will come on
- Professional install recommended
