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dm650 the kit includes a muffler,x-cal2,2 hours of dyno time,k&n filters,labor for install. the price on the kit has changed to 3699.99 due to the labor.

you have to retune the car with a custom tuner and a dyno to get the most out of the headers and exhaust, the tune also will shut down the check engine light that the lack of cats will cause, I dont know about with the stock muffler but with the FRPP one it was pretty loud, as far as difficulty...

http://www.fordgtforum.com/forums/attachment.php?attachmentid=90&stc=1

Headers Ive installed the long tube headers with the FRPP muffler and just the muffler and oil changes on Ford GT's and am really impressed with the quality of the headers, but they are quite difficult to install. Does sound like a formula 1 car driving away though, If anyone has any questions...