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haha...Dude I am pretty much asking the same question.
From the research I have done, 2.25" is about the largest you would want to go in a 4th gen, and maybe smaller if you have a stock motor. A larger pipe isn't necessarily better as it will reduce backpressure. This is desireable if your motor kicks out more HP (like a b16!!), but I think can decrease performance on a d15 for example.
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-Shawn
'91 Civic DX sedan
DOHC ZC, I,H,E, urethane bushings and mount inserts, rock chipped hood, some rust, stock steelies, nice comfy Integra seats, and the A/C works! What else could you want from an 18 year old car with 241,000 miles? Working on getting the Si tranny in now 
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