I recently installed a Bassani O/R X in my car and afterward I can hear what sounds like an exhaust leak coming from in front of the passenger seat. It only happens when I get on the throttle a bit and is especially bad under boost. I checked the header/downpipe connection and retightened the bolts. Leak is still there. At idle I can't hear it and can't tell where it is coming from with the hood up. Is possible I knocked the exhaust manifold loose when I was installing my x pipe? Cracked the exhaust gasket maybe? If I end up needing to check the headers is it worth it to install long tubes while I have things that far apart? What exactly is involved with installing long tubes? Any help that you guys can give would be greatly appreciated.