Thorley Header Project Update
Launching!
Joined: Oct 2009
Posts: 291
Likes: 1
From: Toronto, Canada
I won't be installing for a few month's yet but can we can some feedback once some of you start putting them on? I'd be awesome if somebody could post up some pics or a video. Anybody thought about putting a flex pipe on the rear dp and how that would hook up to the stock pipe or hogan dp. I hope it's some thing I can tackle, kinda worried about rusted bolts or not having a hoist.
I am still waiting for Thorley to contact me. I'd love to pay for these babies.... I got it all set up with my exhaust guy to get them in and to do a little fabrication. While I am at it I plan to change mufflers and tips too. Probably Hooker MaxFlows with dual tips.
-Mike
-Mike
Last edited by Mgpeagle; Feb 5, 2010 at 01:15 PM.
Staging Lane
Joined: Feb 2010
Posts: 71
Likes: 0
From: Kyle, Texas
How hard would it be to install? I called a couple of local shops in Austin, and they were quoting me costs or around a $1000.00!! That plus the cost of the headers - wow. If this is something that could be installed as a weekend project I would sign up. I've got some extra money burning a hole in my jeans, but I don't think the wife would understand an extra grand.
I spoke with some1 today at Thorley's to verify that they had my info. After they confirmed that they did, the guy let me know that they have enough people to lower the price to $599!! Just thought I'd put it out there. And PLEASE don't get cold feet and back out of this!
Teching In
Joined: Sep 2009
Posts: 21
Likes: 0
From: findlay ohio
How hard would it be to install? I called a couple of local shops in Austin, and they were quoting me costs or around a $1000.00!! That plus the cost of the headers - wow. If this is something that could be installed as a weekend project I would sign up. I've got some extra money burning a hole in my jeans, but I don't think the wife would understand an extra grand.
Much better then stock but not aggessive enough. Sometimes, I get a really cool snap when upshifting at part throttle especially when in tap shift mode. The down shifts are 10x improved and almost trans breaking
(not really). Feels like I'm pulling much harder in each gear and the revs climb much faster; but even with tuning I still can't chirp 1-2 or 2-3. I just kit 40K so I figured I would install a shift kit while I was changing the fluid and filter. It was a very easy install and I am satisfied. Dave at TEP said that the stock clutch packs have way to much clearence so shift kits don't really help too much without other mods done inside the trans. Guess I will try to break it so I can have him build me a new one! I want my headers!
(not really). Feels like I'm pulling much harder in each gear and the revs climb much faster; but even with tuning I still can't chirp 1-2 or 2-3. I just kit 40K so I figured I would install a shift kit while I was changing the fluid and filter. It was a very easy install and I am satisfied. Dave at TEP said that the stock clutch packs have way to much clearence so shift kits don't really help too much without other mods done inside the trans. Guess I will try to break it so I can have him build me a new one! I want my headers! I would imagine that the rear header would have to be installed from the bottom of the car and the front header from the top. Dam.. I think the frame and the steering rack might be in the way. If that is the case then we might have to use a floor jack or a hoist to move the engine foward to make some room to install from the top. The only thing that worries me is having to do some welding my exhaust is all custom so I would have to have it rewelded any way.
I would imagine that the rear header would have to be installed from the bottom of the car and the front header from the top. Dam.. I think the frame and the steering rack might be in the way. If that is the case then we might have to use a floor jack or a hoist to move the engine foward to make some room to install from the top. The only thing that worries me is having to do some welding my exhaust is all custom so I would have to have it rewelded any way.
TECH Fanatic
Joined: Jan 2007
Posts: 1,029
Likes: 0
From: LITH, IL.
CARB certification is pricey. If they don't move the cat-con at all, they could try for it, but unless they can piggyback the LS4 headers onto another CARB cert, they won't do it. Too expensive to amortize for such a small run. As far as the piggyback option, I would think the design of the manifolds would make it difficult to compare it to another as it is quite different with a common collector and downpipe. Unless they show you a certificate, they are not emission legal per CARB.
CARB certification is pricey. If they don't move the cat-con at all, they could try for it, but unless they can piggyback the LS4 headers onto another CARB cert, they won't do it. Too expensive to amortize for such a small run. As far as the piggyback option, I would think the design of the manifolds would make it difficult to compare it to another as it is quite different with a common collector and downpipe. Unless they show you a certificate, they are not emission legal per CARB.
That the thing about living in cali,to many smog rules...At least I have another 2 to 3 yrs b4 smog...The only thing that is carb cert on the imp is the the spacer,and that belongs to envoys...F it then,I should run no cat either,right....
Thread Starter
Staging Lane
Joined: Jan 2009
Posts: 87
Likes: 0
From: Orange County, CA
One thing I plan on doing is seeing if the stock front heat shield can be used to cover the front header in some way; I did this on my Buick to keep the OEM look as much as possible when I replaced the stock driver side exhaust manifold with an aftermarket piece on that car.
