IBOAUTO
B58 Gen 1 4.5" Catless Downpipe
Downpipe
$349.00
FitsB58
Downpipe type
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 1 B58 in the 340i, 440i, M240i and 540i. It swaps the restrictive factory downpipe and catalytic converter for a straight-through 304 stainless pipe, so the turbo spools sooner and the car makes more power once it's tuned. A braided flex section soaks up engine movement, and the mounting bracket comes in the box.
- 4.5" 304 stainless, 1.5 mm wall
- Straight-through, no catalytic converter
- Braided flex section
- Bolt-on, no cutting or welding
Fits
- BMW F20 M140i (2016–2019)
- BMW F22 F23 M240i (2017–2021)
- BMW F30 340i / F32 F33 F36 440i (2016–2019)
- BMW G30 540i and G11 740i with the Gen 1 B58
- Not for G20 M340i, G22 M440i, G42 M240i, Z4 or Supra
- 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
- Length
- 645 mm (25.4 in)
- Material
- 304 stainless steel, 1.5 mm wall
- Flex section
- Yes, braided
What's included
- Downpipe with mounting bracket
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
