Hi im in the middle of modifying my original air box so far iv took the box apart and removed the top n bottom reducer pipes and put in a k&n panel filter n I must say what a difference so far! And thats with out doin the ecu reset, thats on my list of things todo as well as the resonator, but my question is what is the plastic thing that comes off of the inlet pipe?? Is it needed? And whats its purpose? Cheers