Header size
Pro
Joined: Nov 2007
Posts: 645
Likes: 0
From: Wellington fl
Here It Comes, I Am In The Minority, But I Say 1 7/8. Why Would You Want To Restrict Them At All? The Scavenging Difference Is Minimal, I'll Take The Peak Hp Over Low End Power All Day, I Am More Of A Drag Racer. I Cant Use It Low Anyway, Car Doesnt Hook. Plus With The Possibility Of A Cam And N20 Later, I Wanted 1 7/8.
Team Owner
Joined: Feb 2001
Posts: 27,236
Likes: 121
From: Short Hills, NJ
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
I have Kooks 1 3/4, on an 05 Z51 6sp. The motor is a forged LS3/L92 427. It makes 525rwhp/500rwtq. I see no reason to move up to 1 7/8 headers for some more top end HP. The cost of going to 1 7/8 headers doesn't justify the HP increase. If I'ed started with the 1 7/8 fine, but I didn't. There's nothing wrong using either one. I still think it's a matter of choice. BTW LG doesn't make 1 7/8 and his 1 3/4's are the ones he uses on his race cars. They seem to work fine. Personal preference again. It seems that there are to many variables in motors, heads, strokes, valve size, rpm range, bore, cam, and tunning to say one is far and above the other. That's my opinion anyway.
Last edited by andreas g.; Mar 5, 2008 at 01:52 PM.
Burning Brakes
Joined: Jun 2002
Posts: 1,037
Likes: 31
From: Richmond Texas
I had 1 7/8" headers with catted x-pipe and borla stingers installed on my C5 and noticed that the bottom end wasn't near as peppy as it used to be. Once over 4000rpm the car would scream but below that it wasn't as much fun as it was with the stock manifolds. I think I'm going to be going with the 1 3/4" headers this time around.
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Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Team Owner
Joined: Feb 2001
Posts: 27,236
Likes: 121
From: Short Hills, NJ
I have Kooks 1 3/4, on an 05 Z51 6sp. The motor is a forged LS3/L92 427. It makes 525rwhp/500rwtq. I see no reason to move up to 1 7/8 headers for some more top end HP. The cost of going to 1 7/8 headers doesn't justify the HP increase. If I'ed started with the 1 7/8 fine, but I didn't. There's nothing wrong using either one. I still think it's a matter of choice. It seems that there are to many variables in motors, heads, strokes, valve size, rpm range, bore, cam, and tunning to say one is far and above the other.
Melting Slicks
Joined: May 2004
Posts: 3,017
Likes: 2
