Hi i own a 89 fastback and i recently bought a regular cone filter adaptor and a K&N cone filter. I hooked everything up, i put a breather on the vacuum hose, and drilled a hole into the stock piping for the IAT sensor. Now my car sounds like a weed whacker or a go kart at low end. The higher i rev it, it sounds better, but low end, like 1-2500rpm, its pretty rough...any suggestions? thanx for your time.
ps
before doing this air filter swap, the motor ran fine
