have you guys seen or looked into the Ford motorsports rear bumper exit headers. Its just a long tube header with a collector at the end and tips out the back of the car like the Borla exhaust... Dont know if its been on here or not but I just looked through ford racing and saw those on there.
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Just looks rather on the aggresive side if you ask me. Im sure it would sound like a screamin devil to run those open headers on a GT. May justhave the grunt some of you guys are looking for.