Help Sizing Single Exhaust: Stock LS1
Thread Starter
Teching In
Joined: Jul 2008
Posts: 6
Likes: 0
From: Cadiz, KY
Help Sizing Single Exhaust: Stock LS1 So its time to start thinking about my exhaust options on my LS1 240sx.
Here is my setup:
bone stock LS1/t56 out of a 99 Camaro
LS6 Intake
C5 center dump exhaust manifolds (no long tubes, future turbo project)
Otherwise this is going to be a pretty well stock setup. Lots of the LS1 240 guys choke their exhaust all the way down to a single 3", but is this too restrictive? Would it be beneficial for me to go ahead and run a 3.5 or 4" single, or would 3" suffice on such a stock setup?
Also, does anyone have any muffler recommendations for a 3.5 or 4" setup?
Mind you, I'd love to run dual exhaust but I really don't have the room beneath the car. I'm trying to maintain maximum ground clearance, as this will be a street car.
Thinking back to my turbo 4cyl days, we always used to run 3" just because it seemed to be the standard. I guess I just have it in my mind that a single 3" would be entirely too restrictive for an LSx engine and would greatly hinder any future upgrades. Any input would be greatly appreciated, thanks for the help.
Here is my setup:
bone stock LS1/t56 out of a 99 Camaro
LS6 Intake
C5 center dump exhaust manifolds (no long tubes, future turbo project)
Otherwise this is going to be a pretty well stock setup. Lots of the LS1 240 guys choke their exhaust all the way down to a single 3", but is this too restrictive? Would it be beneficial for me to go ahead and run a 3.5 or 4" single, or would 3" suffice on such a stock setup?
Also, does anyone have any muffler recommendations for a 3.5 or 4" setup?
Mind you, I'd love to run dual exhaust but I really don't have the room beneath the car. I'm trying to maintain maximum ground clearance, as this will be a street car.
Thinking back to my turbo 4cyl days, we always used to run 3" just because it seemed to be the standard. I guess I just have it in my mind that a single 3" would be entirely too restrictive for an LSx engine and would greatly hinder any future upgrades. Any input would be greatly appreciated, thanks for the help.
Well aside from the crushed, junk y-pipe on f bodies, stock size exhaust is 3". I would say 3" is fine, especially on a stock LS1.
I have a full 3" from my TSP catted y pipe all the way back on my H/C car.
EDIT:
Are you going to have a muffler thats in 1 and out 2 like an f body has or are you talking about a single pipe all the way back and 1 muffler and 1 pipe outta the muffler?
If its that way, I would use 3.5" if youve got the room.
I have a full 3" from my TSP catted y pipe all the way back on my H/C car.
EDIT:
Are you going to have a muffler thats in 1 and out 2 like an f body has or are you talking about a single pipe all the way back and 1 muffler and 1 pipe outta the muffler?
If its that way, I would use 3.5" if youve got the room.
TECH Resident
Joined: Jul 2009
Posts: 753
Likes: 323
Well aside from the crushed, junk y-pipe on f bodies, stock size exhaust is 3". I would say 3" is fine, especially on a stock LS1.
I have a full 3" from my TSP catted y pipe all the way back on my H/C car.
EDIT:
Are you going to have a muffler thats in 1 and out 2 like an f body has or are you talking about a single pipe all the way back and 1 muffler and 1 pipe outta the muffler?
If its that way, I would use 3.5" if youve got the room.
I have a full 3" from my TSP catted y pipe all the way back on my H/C car.
EDIT:
Are you going to have a muffler thats in 1 and out 2 like an f body has or are you talking about a single pipe all the way back and 1 muffler and 1 pipe outta the muffler?
If its that way, I would use 3.5" if youve got the room.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
I like the bigger pipe for the sound. However running 3.5 or 4 inch in out mufflers really limit your choices. There is a ****-ton of choices in 3 inch. Here's my 4 inch sinch exhaust thread. It may be of interest.
https://ls1tech.com/forums/multimedi...pics-vids.html
https://ls1tech.com/forums/multimedi...pics-vids.html
Thread Starter
Teching In
Joined: Jul 2008
Posts: 6
Likes: 0
From: Cadiz, KY
I like the bigger pipe for the sound. However running 3.5 or 4 inch in out mufflers really limit your choices. There is a ****-ton of choices in 3 inch. Here's my 4 inch sinch exhaust thread. It may be of interest.
https://ls1tech.com/forums/multimedi...pics-vids.html
https://ls1tech.com/forums/multimedi...pics-vids.html
Trending Topics
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
The flowmaster merge is relatively easy to find. Its a dual 3 inch in with a single 4 inch out. They have different set-ups as well like two 3s into one 3.5 and two 2.5s into one 3 and such. 4 inch in/out mufflers can be harder to find though. They are actually not very common. I had to bite the bullet and pay more for this flowmaster then any other in the past. Merge:
http://www.summitracing.com/parts/FLO-Y300400/
Muffler: (picture is not of actual muffler)
http://www.summitracing.com/parts/FLO-954010-12/
http://www.summitracing.com/parts/FLO-Y300400/
Muffler: (picture is not of actual muffler)
http://www.summitracing.com/parts/FLO-954010-12/
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