Please post your before and after dyno sheets here.
I would like to start a collection of dyno verified modifications.
For instance, Cold Air Induction vs. stock has already been done.

I would like to the see the following before and after runs.
1. Long tube headers
2. Short tube headers
3. X-pipe
4. No-cat x-pipe
5. Mufflers
6. Throttle Body spacer
7. CMCV delete plates
8. Underdrive pulleys
9. Electric water pump
10. Tornado Air (LOL)

How hard would it be to rent a dyno and swap parts and retest the above items? I am sure people have before and after runs, please post here, even the ones you disagree with or are not happy about.