ApexBuilt® BMW F97 X3M & F98 X4M Resonated Mini-Cat Downpipes (S58, 2020+)
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® BMW F97 X3M & F98 X4M Resonated Mini-Cat Downpipes offer...
• Perfect fitment, guaranteed.
• No check engine light, no error codes. No need to unlock your DME, 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
These these parts are for OFF ROAD / RACE USE ONLY . They are not 50 state legal. Any of our catless race downpipes WILL NOT be sold in, or shipped to, the state of California. We advise you to run a tune on your vehicle for best results.