wm_sorg

Hi All,

I am trying to figure out what I am doing for my exhaust system for my LS1 thirdgen.

The 2001 engine is stock with the exception of cam, springs, and pushrods. No head porting yet, headers or power adders.

Unfurtunltely, I need to run cats. I was considering 3" pipe, cats, etc. from the engine all the way back. Is this overkill for this setup? Since I can not run headers, I was hoping to make up for some of the restriction on the back side.

All thoughts appreciated.

BILL

1bdbrd

iTrader: (1)

3 inch is not too big for an LS1. in fact its on the smaller side of LS1 exhausts. some people are running 4 inch setups on stock motors and not losing any power...:hail:

25THRSS

I dont think it will be too big. Why dont you just get the mufflex y pipe and catback. On my heads/cam LS1 with bolt ons I am running PPC headers, which are the grot design, with a 3 inch y pipe into a 3.5 inch single exhaust back to a crossflow muffler with dual 3 inch outlets. I will be getting dual 3 inch cutouts soon as well.

wm_sorg

Sounds like a great setup. Do you have pictures?

25THRSS

I will have pictures within the next couple weeks. I actually don't have the y pipe yet because the owner of PPC is still working out the bugs, but it should be ready very soon he says. I'll send you some pics of the headers as soon as I get some.

89gta383

iTrader: (5)

Import guys run 3" exhaust. That's on a 4 banger. Run at least 3".

Z28ricer

iTrader: (2)

Import guys also run 6" exhaust tips, does this mean we should all get at least 6" tips ?

jfreeman74

Go with the 3" at least. Anything smaller would almost be choking the engine.

SS3933

Man, talk about a small world. I'va had the same Y with random metallic cats on back order since the beginning of March from PPC. PPC Headers are installed and I'm currently using an OR "Y" until he gets the finished product Gordon's a great guy though and I respect his attention to detail so I'll wait.
Back to the topic, on my 01" SS I'm running the PPC LT's as mentioned above with a 3" "Y" with metallic cats into a Corsa 3" cat back. 3" is by no means too big unless you're talking about ground clearance issues. Mine is lowered 1.5" so I defintely didn't want to go any bigger. Hope this helps

SS3933

Oh, here's some pics

camarojoe

Some guys run 80 iq brains, does that mean we all should lower our iq's?

wm_sorg

Thanks for the pictures. I will go with 3" if I can clear it. Otherwise I will go 2.75 or 2.5 until I get past the tail shaft and go 3" out to the back.

Thanks to all who have posted.