Made my own exhaust and Cai. I was just playing around and removed 2nd cat and ran it halfway down car and its about 6" short of sticking out from under passenger side. I removed the silencer and made my own CAI out of my old turbo piping from my mustang. Did not mess with anything else. We have a road we test on and it is farely accurate. Hit 99mph before multiple times, managed a 111 this time... AFTER two runs I did another, it is an auto and would make a supra ish backfire between shifts. Not crazy loud or poppy just a deep pop. In the middle of 3rd it just quit pulling.. check all connections, couplers ect and nothing. Still a day after if I get it in it just creeps. NO noise or drive issues, revs clean ect. Just wont move hardly. Not throwing a code somehow. Thanks for the Help in advance. it was around 30 degrees out, and I believe it is pulling fuel somehow.