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cats will defintley make it a bit quieter...i think u'd see better performance w/ high flow cats than the stock ones though....
 

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High flow cats should knock down the sound just a bit but not much. The H.P. should stay right up there with maybe just a little loss.

D.J.
 

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About a 5 to 7 HP difference. Nothing that you will feel :cheers:
 
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