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On my VE I gain zero total HP by removing the cat and replacing it with a test pipe. To repeat, the peak power remained the same. And my car is making 185whp NA. Now for some strange reason I did gain 15whp in the midrange (5K) right after the cam switch points with out the cat. That is very weird. If you truely "gut" the cat I think you will loose power. The cat has a design that actually allows the air to flow thru it properly. Once you gut it it will just be this hollow can. The air will not actually be controled by the shape of the honeycomb and you will probably loose power. If you are running a turbo monster get a test pipe made for the track or a 3 inch Hi-flow cat.
 
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