Another thing I forgot to mention... Flow mods. I was reading up on one of the posts. Everyone was listing their max Boost PSI. I was curious 'cause I thought I had an issue with a 3.4". However I have MASSIVE flow mods w/ the SD Headers, rockers, full 2.5" exhaust, big res, big tips, etc, etc. I only make an efficient 7-8 lbs of Boost. Some people with less flow will see higher numbers. Higher Boost doesn't always mean better results. Ppl will tell u Boost = restriction in some cases. Hope some of this helps.