How much hp should my stock 2000 GTP gain with full exhaust
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Zero.
Full exhaust meaning headers?
maybe 10-15 hp
10-15 but headers should be your first mod
The other posters hit the nail on the head - you'll gain a few HP, not enough to be really noticed by your butt meter.
But exhaust work is a prerequisite for a pulley drop to the 3.5 range, which will net you 25-30 HP. And that is noticeable.
^ that. Exhaust works (headers) just gets you to the point where you can pulley drop safely which you'll notice the power increase more then a full exhaust would.
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