I have an '89 GT that Im in the process of installing a T-5 in. Well when the last exhaust was put on the car they welded the h-pipe to the cat back. Im going to have to take a saw to it too remove it. Can I test drive the car without the H-pipe in or will it cause me problems? Can the exhaust just be unbolted from the headers an moved enough to get the tranny out? Thanks.