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well I gained 5whp going from a section of 2 1/2" pipe that was about 3 feet long with a flexi joint and a small open flowing muffler to a open megaphone.
I also tested with a 3" pipe with a big muffler welded on the end and went to the 2 1/2" pipe described above and gained 5whp. so thats a 10whp increase from changing from a 3" almost full system exhaust to a megaphone welded onto the header..
 

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test pipe to high flow cat can vary from what i have read... if a high flow is that as you buy it say like thermal's, look for like 3-5 i think and if you whack out all the crap in your stock cat (ghetto high flow) its like 1-3. test pipe is like 5-10 as stated. theres a lot of info about this on the web, just look around :up: :up:
 
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