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There are minimal gains to be achieve through cat back exhaust modifications especially with out proper PCM calibration. We offer Kooks long tubes at our web page an have some sound clips associated with the product listings, to help get a judgment of what to anticipate.
I typically recommend to clients that want the results (Horsepower) with out the drone some aftermarket cat backs have, is to stick with your stock exhaust in the short run, and realize the performance gains, then if you want more noise, add in a quality exhaust system.
Regards
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