OK , like i've posted in many threads, headers and exhaust are the most important thing for out cars right now. W/out them, and mods you do will not acheive their HP gain potentials, not even close. If you can't flow exhaust out of your motor, adding more exhaust by modding other parts of your motor are near useless. Now I know someone posted a couple months back about looking for a donor car for a header/ exhaust mock up, in fact I saw at least 2 different people looking for cars. 1 offered the total system free and the other said a discount. Does anybody know the status of any headers or exhaust besides a GM approved Corsa cat back? If they found a donor car the system should be done and dyno tested.....Anyone???