APEXBUILT® G87 M2, G80 M3, & G82/G83 M4 RESONATED MINI-CAT DOWNPIPES (S58, 2021+)

*FROM APEX BUILT, INC*

NO TUNE REQUIRED!

Our unique O2 sensor housing design allows for a direct bolt-on installation, without resulting in a check engine light – even on otherwise fully stock cars. 

ApexBuilt® G8X M3/M4 Mini-Cat Downpipes offer...

• Perfect fitment, guaranteed. 

• No check engine light, no error codes. No tune required. 

• Drastically improved throttle response, quicker turbo spool, and an aggressive exhaust note.

• Estimated gains of 20-25+ wheel horsepower and 40-50+ TQ when installed on a vehicle that is not tuned.

• Estimated gains of 60+ HP and 100+ TQ over stock power levels when paired with an aftermarket ECU tune.

• T304 stainless steel construction 

• Lifetime warranty