I love the icebox. It is quiet most of the time but when you punch it you can hear it. I think its alot quieter than other intakes. I liked it because it doesnt sacrifice your midrange, thats also the same reason i went with 4-2-1 header. The DC is made very well. If i had more money i would have went with the comptech header. But all in all i like the combonation. I have not yet seen the potential of both of these since i have not gotten exhaust yet. I plan to get the rsr exmag and a high flow cat so then i realise my gains with this set up.