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[andyx181x]

Originally Posted by MonaroGTO

Will adding a Spintech 2.5" Catback w/X -pipe provided any horsepoer gains? Will adding the 3" Catbak provide any power loss to a stock 06 A4?

exhausts and CAI dont really give results in terms of HP. at most your looking at 1-3 HP gain, headers is where its at. and you dont want to really go with 3" thats a big pipe that might set of the O2 sensor or worst screw with your emissions.