Just curious: Headers, X-pipe necessary?
Burning Brakes
Joined: Sep 2018
Posts: 1,023
Likes: 174
From: Auburn Al
the only way this would be believable is if you would have tuned it first, but you didn't. if you had just tuned it first you would have found yourself at the 400 make any way. if you look at the stock manifolds they look like cast shorty headers, and they work pretty well too, I love that everyone thinks they know something that GM doesn't
Safety Car
Joined: Nov 2007
Posts: 4,435
Likes: 874
From: Bay Area CA
C6 Z06 and ZR1 mid pipes are 3", and '06-'10 C6 Z06 came with H pipe, 2011+ came with X-pipe...but the '12/'13 models have the extra 2 cats attached before the X. '09-'13 C6 ZR1 came with X pipe, but again the '12/13' models have the 2 extra cats. No idea on Base/GS for H versus X, but pipe diameter is 2.5" for all years.
The base 2008+ C6 corvettes came with "X" pipes. I believe the base pre 2008 came with "H" pipes.Having had both, the biggest difference between the two are more for sound than power. Normally, H pipe will have a deeper sound than the X pipe. The X pipe does a better job scavenging exhaust at higher rpm and the H pipe at lower rpm. Comparing the two, expect 1-3 average HP from the X pipe and the same for the H pipe in average torque.
Last edited by Mike's LS3; Jul 14, 2019 at 12:09 PM.
Burning Brakes
Joined: Sep 2018
Posts: 1,023
Likes: 174
From: Auburn Al
it happens all the time, my LS2 stock 347 after the first tune 379 talk to a tuner now your gonna tell me my LS2 heads cam intake can't be putting 500 to the rear tire, it is
