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I did notice a difference. It feels like I've gained some HP. Not a huge amount. Maybe 10-15 if I had to guess. The biggest difference is in sound. It's definitely louder but since I kept the stock muffler it's not so loud as to upset the neighbors. It sounds great (when my muffler isn't acting up) around 3K rpms in 2nd and 3rd. So far I am very satisfied with the NHP headers and pipes.
My new muffler is out for delivery!!!
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TimAustinW
http://i226.photobucket.com/albums/d...ignature-1.jpg
02 Seal Grey, NHP Headers w/ Highflow Cats/2ndary Bypass Pipes, smoked side markers/3rd brake light, exterior match interior trim, 986 Lloyds Mats, 986 deck lid emblem, arctic silver intake grills, ipod link, painted calipers, Glass Window Robbins Top with defroster kit, Bose Sound System, Leather lower door panels, Console Lid w embroidered crest; Stainless door sills; Painted Bumperettes; Custom Hood Crest
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