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I currently run the ARH 1 7/8" headers and catless long system into a flowmaster outlaw axleback. I had a definite noticeable gain with just the headers and long system. After tune there was another definite gain and after swapping stock mufflers for flowmaster outlaw series there was another small gain. My car has never been on a dyno, however by means of the butt dyno and practical application the car is a lot faster.
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