Stock exhaust diameter?
03-28-2005, 10:39 PM
#1
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Stock exhaust diameter? What is the stock diameter of the LS1 exhaust? Is it a must for a huge HP improvement? I was possibly thinking of just keeping the stock muffler for a while and putting on a test pipe in place of the cat. I will probably be doing this until I can get the cash together for some LT's and TD's.
03-28-2005, 10:44 PM
#2
Non-SLP cars: 2.5" Y-pipe, 2.75" I-pipe, 2.5" tail pipes
SLP cars: 2.5" Y-pipe, 3" I-pipe, 2.5" tail pipes
I know the 3" catback helps power along with the better muffler. Honestly I don't know which would give the best gain, off road pipe/stock system or 3" catback, but gutted cats and O2 sims are cheaper than a catback.
SLP cars: 2.5" Y-pipe, 3" I-pipe, 2.5" tail pipes
I know the 3" catback helps power along with the better muffler. Honestly I don't know which would give the best gain, off road pipe/stock system or 3" catback, but gutted cats and O2 sims are cheaper than a catback.
03-28-2005, 10:56 PM
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Originally Posted by Kurt D
Non-SLP cars: 2.5" Y-pipe, 2.75" I-pipe, 2.5" tail pipes
SLP cars: 2.5" Y-pipe, 3" I-pipe, 2.5" tail pipes
I know the 3" catback helps power along with the better muffler. Honestly I don't know which would give the best gain, off road pipe/stock system or 3" catback, but gutted cats and O2 sims are cheaper than a catback.
SLP cars: 2.5" Y-pipe, 3" I-pipe, 2.5" tail pipes
I know the 3" catback helps power along with the better muffler. Honestly I don't know which would give the best gain, off road pipe/stock system or 3" catback, but gutted cats and O2 sims are cheaper than a catback.
Ok, sweet. I would think 2.5" exhaust would be good to about 400hp or so but I may be wrong. Hopefully I can temporarily replace the cat with a ORP and maybe the stock muffler with a hooker aerochamber.
03-29-2005, 08:38 PM
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Originally Posted by Another_User
My measurements showed that on my Z28 with a 2.75" I pipe, it actually measured 2.5" at the muffler inlet. Just something to think about.
