i just bought an 09 jcw off the lot and was looking for some help... first, i've read a number of threads re: the JCW stock CAI... however, I've also noticed that some have replaced their JCW CAI with an aftermarket one.... what is the purpose of this? I thought the JCW CAI was already an upgrade; as its already part of the stage 1 tuning kit...

2nd, is if there are any tubing upgrades that are adaptable to the JCW CAI.... i saw that alta one, but it looks like you are replacing the whole airbox...

lastly, i know the JCW comes with upgraded exhaust... is this only cat back? Is there anything to upgrade? how is the stock downpipe?

Thx