The OEM design is a little lacking on this platform with unequal length pipes and some tight 90 degree angles around the gearbox. This single midpipe system increase flow, sound and power. On this exact system we have made over 1000 BHP due to the great flow characteristics. For those wanting to retain oem calibration or not wanting to remap their ECU we can code the OPF out, for those opting for the route of tuning that is not required.
We personally love the sound of this system with the OEM catalyst converters, we believe the car sounds like a true M car with this single midpipe.
Velocity Tuning
Colchester, CO7 7PN, United Kingdom