im going to start on my down pipe tomorrow for my stock Z6 w/ 14b, im running a external wastegate, and im gunna run the dump tube to the down pipe, does anyone think i need a 3" or can i get away with 2.5" - 2.75"

 

anyone?

 

with a 14b you will be ok with a 2-1/2 exhaust, evenwith the dump tube tied into it.

 

alright man thanks, now a can start on it