Bmc are so restrictive ask badger bill some one who nos what they are taking about , if you can't feel the difference it makes taking it off there is some thing up with your car, I sold mine ages ago
in the know or not, iv read the airflow that my vagcom logged and its fine. albeit iv got extra air coming in from the top of the pipe and iv rerouted the cai to the front grill, but thats just a monkeyspanner job