Exhaust on 3RD gen LS1
Thread Starter
On The Tree
Joined: Jul 2002
Posts: 160
Likes: 0
From: Sterling, VA
Exhaust on 3RD gen LS1 Hi guys,
I am in the process of planning an LS1 swap into my third gen firebird. Unfortunately, I need to have cats on the system. If I run the factory 4th gen exhause I understand there will be clearance issues with the passenger side floor pan. Does anyone here have any pictures of the factory 4th gen exhauset that I can use for comparison.
Any thoughts os suggestions would be greatly appreciated.
I am in the process of planning an LS1 swap into my third gen firebird. Unfortunately, I need to have cats on the system. If I run the factory 4th gen exhause I understand there will be clearance issues with the passenger side floor pan. Does anyone here have any pictures of the factory 4th gen exhauset that I can use for comparison.
Any thoughts os suggestions would be greatly appreciated.
Re: Exhaust on 3RD gen LS1 This an excellent link, SpearTec did what you are working on.
https://ls1tech.com/ubb/ultimatebb.p...=000017#000000
https://ls1tech.com/ubb/ultimatebb.p...=000124#000000
<small>[ August 18, 2002, 03:23 PM: Message edited by: 99 Black Bird T/A ]</small>
https://ls1tech.com/ubb/ultimatebb.p...=000017#000000
https://ls1tech.com/ubb/ultimatebb.p...=000124#000000
<small>[ August 18, 2002, 03:23 PM: Message edited by: 99 Black Bird T/A ]</small>
Teching In
Joined: May 2002
Posts: 25
Likes: 0
From: Kiel, WI
Re: Exhaust on 3RD gen LS1 When I did my exhaust, I used the hooker shorty headers for the LS1 and Random Tech. high flow cats. I had a local exhaust shop make a Y pipe, the Y pipe bolts on to the third gen Cat Back exhaust system. I also put a cut out in the intermediate pipe just before the rear axle.
This may be a little restrictive for a modified engine, but I feel for the base (stock) LS1 engine it is just fine.
As I modify the engine, I will eventually make a dual exhaust with the pipes exiting before the rear tires.
I'll take some pics and put them on my website tonite.
Ok the pics are on the website
<small>[ August 22, 2002, 06:16 PM: Message edited by: LS1 IROCZ ]</small>
This may be a little restrictive for a modified engine, but I feel for the base (stock) LS1 engine it is just fine.
As I modify the engine, I will eventually make a dual exhaust with the pipes exiting before the rear tires.
I'll take some pics and put them on my website tonite.
Ok the pics are on the website
<small>[ August 22, 2002, 06:16 PM: Message edited by: LS1 IROCZ ]</small>
Teching In
Joined: May 2002
Posts: 25
Likes: 0
From: Kiel, WI
Re: Exhaust on 3RD gen LS1 My ground clearence is pretty low, mainly because of the transmission mount, and the car is lowered also. Heat issues shouldnt be a problem. the factory exhaust is really close to the tranny too. I have a 6 speed, so I can't say anything about the auto for sure.
Thread Starter
On The Tree
Joined: Jul 2002
Posts: 160
Likes: 0
From: Sterling, VA
Re: Exhaust on 3RD gen LS1 When looking at the car from a distance from the side or rear does the exhaust hang down? Also, are those random 8100 bullet cats?
Again I appreciate your help and insight.
Again I appreciate your help and insight.
Teching In
Joined: May 2002
Posts: 25
Likes: 0
From: Kiel, WI
Re: Exhaust on 3RD gen LS1 I bought my cats from Thunder racing, in the LS1 / exhaust section.
this should get you there.... Thunder ....exhaust link
On my car the part of the y pipe that goes directly under the tranny is the lowest part.
The setup in the pics is my first attempt... it has woked well for the past 2 years. I am in the process of designing a new trans. mount, which will allow the exhaust to run differently also.
The reason I have asuch a big trans mount is because all 4 bolts for the factory trans mount broke off in the framewhen the old engine was removed.
this should get you there.... Thunder ....exhaust link
On my car the part of the y pipe that goes directly under the tranny is the lowest part.
The setup in the pics is my first attempt... it has woked well for the past 2 years. I am in the process of designing a new trans. mount, which will allow the exhaust to run differently also.
The reason I have asuch a big trans mount is because all 4 bolts for the factory trans mount broke off in the framewhen the old engine was removed.
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Thread Starter
On The Tree
Joined: Jul 2002
Posts: 160
Likes: 0
From: Sterling, VA
Re: Exhaust on 3RD gen LS1 Please keep me up to date with your latest design. I am thinking of a varation on yours however I need to keep the pipe away from oil pan. You might want to check http://www.skulte.com/T56.html
They make a trans mount for a t-56 in a third gen.
They make a trans mount for a t-56 in a third gen.
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