|
Currently have a 3" downpipe, otherwise stock exhaust 12' 328i and it has no drone.
Exhaust clamps are fine, and I am certain that is not the cause of your drone, as I broke mine (Rusted threads, tore them right off) and it is currently leaking, still no drone inside the vehicle.
If its not too much trouble for you, try installing the stock muffler.
Do you have a tune to support the cat removal?
|