Hi all, probably lots of posts on here but as I'm sort of new to these cars and forum I would just like to get in the picture where I am and get some straight answers for the best.. I have a 2006 350z GT.. I've already put a cobra mid box and back box on and installed a piper cross panel filter. Today, I've just ordered a plenum spacer. Next week I will be ordering the cobra Y pipe and the Berks hfc's. What advice I'm after is, I will be getting the up revv once these parts are fitted but should I stick with the piper cross panel filter or go for an induction kit.?? I'm after producing as much power gain as possible. Thanks.