I ordered 3 items; an AF/X UDP, Iceman intake, and trubendz 2.5'' exhaust. I finally installed my intake and UDP over the weekend. I test drove it with the intake first and could definately feel the difference, but maybe that was because it was like 40 degrees outside. Then I installed the pulley and it seems to run cooler, the air sucks, it warms up faster, and the revs drop much more quickly but other than that I don't really feel much except when I floor it and then it picks up after 4k it seems. However, my exhaust has yet to show up and I ordered it the same days that I ordered everything else. I have e-mailed them and called but they don't pick up the phone and don't respond to e-mails. I payed over the internet by the way through paypal so I hope they check it or have sent it b/c I'm getting pissed. Hopefully when I get it I'll not only have sound but a lil' more power. My next items will be a throttle body and flexpipe. Or I might save up for that new SVT combo b/c I live in California.