the same
Difference LS3 : LS7 Exhaust Manifolds?
Burning Brakes
Joined: Nov 2004
Posts: 988
Likes: 4
From: Livermore CA
No need to extrude hone them, the OEM LS7 manifolds are welded tubing not cast, so they are already smooth. I recently saw a thread where someone put the entire exhaust system, manifolds 3" h-pipe and mufflers from a ZO6 on an LS3 and gained 30 hp.
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Drifting
Joined: Dec 2004
Posts: 1,518
Likes: 1
Wow, that's a healthy gain. Those numbers cannot be to the rear wheels, though?
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
sneaky=good 
Drifting
Joined: Sep 2007
Posts: 1,283
Likes: 7
From: Hurst (Fort Worth area) Texas
St. Jude Donor '09
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Over the Christmas holiday I installed a 2007 C6 Z06 exhaust system (manifolds, Cats, H pipe) plus Corsa Z06 3 inch Sports on my 2006 C6 A6. I did a pre and post dyno run on a Dynojet 248 for comparasion. The car was tuned (A/R ratio, timing, etc) to the same level for each dyno pull. Pre Z06 exhasut was 343 rwhp and post was 373 rwhp. There are a bunch of Z06 guys putting headers on the Vettes. The shop I use had 4 pairs just collecting dust. However, the Z06 guys tend to keep their NPP mufflers, but Corsa, B&B and Borla all make 3 inch Z06 mufflers. The installation was not difficult. I bought GM LS7 manifold gaskets and some O2 sensor wire extensions for the forward O2 sensors. The clearance around the A6 transmission is tighter than I want, so I will get some minor exhaust pipe work. Manual transmission C6's should be no problem at all. Bottom line. I think this is a good 30 hp mod for C6 Vettes if you can get your hands on a discarded Z06 exhaust system.
Le Mans Master
Joined: Mar 2002
Posts: 6,885
Likes: 2
From: Corpus Christi TX
I find 30 to the wheel very hard to believe. 
but, having said that, unless I do a cam swap to my C6z, I'm leaving the factory manifolds alone. I'm already making 485/455 with a couple bolt ons and a tune, and there's zero issues. No codes, no fear of sniff testers, no nothing. Just like showroom stock daily driving with a 40hp increase.
but, having said that, unless I do a cam swap to my C6z, I'm leaving the factory manifolds alone. I'm already making 485/455 with a couple bolt ons and a tune, and there's zero issues. No codes, no fear of sniff testers, no nothing. Just like showroom stock daily driving with a 40hp increase.
Moderator
Joined: Dec 2002
Posts: 40,898
Likes: 4,351
From: Lakewood Ranch, FL
Racer
Joined: Jul 2002
Posts: 287
Likes: 2
From: Mt Pleasant Sc
LS7 Exhaust manifolds
Hi:
I am waitng for someone to make extensions for these manifolds that continue the individual passages to about 20 to 25 or so inches to simulate headers. I am sure this can be done , but will take a lot of time. In wonder what the advantage will be?
Somebody ! !
Ed
I am waitng for someone to make extensions for these manifolds that continue the individual passages to about 20 to 25 or so inches to simulate headers. I am sure this can be done , but will take a lot of time. In wonder what the advantage will be?
Somebody ! !
Ed
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
got to be kidding,,,,,,,,,,,,,,,,,,,,,,,,,,,,