hey Nick. Thanks mate and the CAI I was looking at was the K&N one. The K&N CAI does make sense to me. It runs a straight line to the engine and the intake is in the grill above the road (this matters in Australia!!) as opposed to the factory that sucks off the road and takes an S-path to the engine. What is the difference between the square and circle K&N CAI for the E30?
However, its my first 318i and I have had no experience with it like you guys have had.