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I have a catted Mac pro-chamber on the 'stang running straight thru pipes with tips. The problem is that it's not loud enuff. I am used to having a o/r x & magnapacks on my old '02. I want to leave the cats on, until the warranty runs out, and have a custom made x-pipe made keeping the straight thru pipes & tips. Will that make the car any louder than the pro-chamber? Thanks