Wanted to change something about the engine soon, namely 1. Air filter is at the moment a K & N exchange filter in it what do you think of the BMC Airbox is the elaborate so something to install yourself. 2.Samco pressure hoses. Will also let the car chip from Wimmer have a couple of you experiences with those, exhaust is also changed Eisenmann level2 or can you recommend me something else. Greeting Kai