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Is it the fact that a race header has no cat why they are so loud? If so would adding a high flow cat reduce the noise? Also, how would this effect horsepower? If a cat won't quiet it how will adding another resonator effect the horsepower increase?
 

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well basically yes. YOu would have to weld in a cat/resonator into the setup somewhere. Best place would be in the catback setup. There's a long straight pipe (At least on my Borla) that could be cut and have something welded in there to quiet the noise..
 

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yeah it should only lose you about 1 or 2 hp but it should help to quite the car. Yes and it is best to but it where is is not too far from the headers becuase it works because te exhaust is hot.
 
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