For the CAI to be totally effective and make good increases in power you also have to do the exhaust. If you can afford it a CES cat back system will cost you $960 plus freight and give you +/- 9kw atw. Add a TRD CAI for about $550 (not sure of exact price) and you'll have about 112-117kw atw. From standard that's about a 20kw gain for say $1500 and the car will sound the goods and have more power low down as well as top end. All depends on how much you got to spend, but I'd definatley go with the TRD CAI.