True gains from exhaust

Tax returns are coming and I want to do some exhaust work. I already did a Y-pipe and that gave a me a good noticable gain. I'm planning on getting the Cattman cat-back and a custom enterprise test pipe. Anyone know what type of power gains I can honestly expect? I've read that some people say the test pipe will only gain 1-2 hp but I don't believe that for a second. My friend has a 1999 accord coupe v6 and he dyno'd 12hp and 11 ft-lb of torque more than stock with his cat-back and test pipe. Also anyone have any reviews on the Cattman cat-back? I heard caesars and its the best sounding maxima i've heard yet but I think he claims the sound came from the Cattman headers. Anyone have a Cattman exhaust with a regular Y-pipe that sounds good with no ricey sound?

Have you tried the .org? I know there is a thread with a ton of clips in the 5th generation forum. You should be able to find it there.