Thanks for info!
I have a 2-1/2 custom made set-up, all flanged to ease takin in and out. The X crossover was made straight so when you look thru it at any end it's looks perfectly thru 2-1/2"s. I was going to fit it to my Z71 getting rid of the cats...maybe later? I read somewhere(Carcraft) if you take a vacuum gage to the exhaust to see if big enough? If it makes a sertain number of "s of vacuum or more the pipe should be bigger, I'll look for it again. By the responces and the exhaust pro that built it I sould be able to throw quit alot of HP to it.
Thanks.
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