Just a quick question regarding decats on M54 engined e46's.
When i was doing my clutch and flywheel, i started the car (in neutral!) to make sure everything was ok, and aside from making a lot of noise, the car ran fine no dash lights etc.
I know that from the manifolds back, my 320ci (2.2) has cats but no sensors.
It has upstream sensors, manifold cats, downstream sensors and then second cats. Does this mean i can remove the second cats and create a little more noise from the car? Looking for some thoughts on this/ and opinoins.