IBOAUTO
B58 Gen 1 5" High-Flow Catted Downpipe
Downpipe
$729.00
FitsB58
Downpipe type
High-flow catted. Aftermarket catalytic converters are not EPA or CARB certified, so check the emissions rules where you live before using it on the road. Details
A big-bore 5" downpipe for the Gen 1 B58 that keeps a 200-cell high-flow catalytic converter. You get the quicker spool and power of an aftermarket downpipe with a cat still in the exhaust. Going to 5" gives the exhaust more room to flow off the turbo, for less back pressure and more headroom on tuned cars, and a heat shield keeps the extra heat away from nearby parts.
- 5" diameter for maximum flow off the turbo
- 200-cell high-flow catalytic converter
- T304 stainless with heat shield
- Bolt-on, no cutting or welding
Fits
- BMW F22 F23 M240i (2017–2021)
- BMW F30 340i / F32 F33 F36 440i (2016–2019)
- G30 540i and G11 740i with the Gen 1 B58: ask us before ordering
- Not for the 330i (4-cylinder)
- Not for G20 M340i, G22 M440i, G42 M240i, Z4 or Supra
- Confirm fitment with your VIN before ordering
Specs
- Emissions
- High-flow catted (200-cell)
- Tune
- Tune recommended
- Diameter
- 5 in
- Catalytic converter
- 200-cell high-flow
- Material
- T304 stainless steel
- Heat shield
- Yes
What's included
- 5" catted downpipe with heat shield
Install
- Bolt-on, no cutting or welding
- Reuses factory O2 sensors
- A tune is recommended; without one the check engine light may come on
- Professional install recommended
