After searching for a 2004 cai, then getting the wrong volant sent to me I decided to make my own. I'm most concerned with it having as few bends as possible and keeping it in the small confines of the stock intake. Used 4" polished aluminium and am pretty happy with the results. I still need one more 4" coupler to replace the one home made I had to use in front of the MAF. Sounds so much better, hoping to see some hp improvement as well.