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No, you will actually gain HP and TQ. A 996 with no cats and no mufflers ie a pipe straight from the headers to the exhaust tips makes nearly 17-20 hp on the dyno. TQ is higher across the band as well. Some ECU tuning is needed to make the most of that.
The trick to your respective butt dynos is that you add a little gas and hear a whole lot of noise but don't feel the acceleration you are used to go with the noise.
A car with no cats or mufflers is very very loud. You wouldn't want this for the street. In fact I couldn't stand waking up the whole neighborhood once a week to sneek out to the race track on a sat morning.
As of right now I am running with Cat bypasses but with mufflers for a very nice compromise. Car still makes 299RWHP on the dyno.
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