Exhaust SIZE question
Thread Starter
On The Tree
Joined: Jan 2007
Posts: 112
Likes: 1
From: Kingston, Ontario, Canada
Exhaust SIZE question LS1 Firehawks came with the 3inch stainless SLP sys. with the stainless SLP muffler right?
Well, I want more flow/sound, if I go aftermarket, should I up to a 3.5/4 inch cat back or would decrease the backpressure and lose power in the end?
I yes, lose backpressure/power and I stay with the 3 inch pipe size, why am I changing it in the first place?
Couldn't I in theory, change the muffler to meet my sound specs and leave SLPs work intact?
I'm thinking of adding the QTEC off road Y pipe with the dual cut outs and save the orig. for e-testing and leaving SLP's stainless 3inch intermediate pipe and adding possably a GMMG muffler setup, or corsa.
I heard a corsa on a red WS6 with a cam and it sounded wonderful.
I may heed the advice of others as well and leave the manifolds in place and do like I said, the Y pipe and muffler mod.
What do you guys think about the pipe size relavance though, do I make any logic?
Thanks,
Ryan
Well, I want more flow/sound, if I go aftermarket, should I up to a 3.5/4 inch cat back or would decrease the backpressure and lose power in the end?
I yes, lose backpressure/power and I stay with the 3 inch pipe size, why am I changing it in the first place?
Couldn't I in theory, change the muffler to meet my sound specs and leave SLPs work intact?
I'm thinking of adding the QTEC off road Y pipe with the dual cut outs and save the orig. for e-testing and leaving SLP's stainless 3inch intermediate pipe and adding possably a GMMG muffler setup, or corsa.
I heard a corsa on a red WS6 with a cam and it sounded wonderful.
I may heed the advice of others as well and leave the manifolds in place and do like I said, the Y pipe and muffler mod.
What do you guys think about the pipe size relavance though, do I make any logic?
Thanks,
Ryan
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
I thought the factory pipes were 2.5" all the way back, just the tip was like 3".
3" exhaust for a stock engine is too big. I have 3" all the way back to my muffler but I also have 436 cubes.
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3" exhaust for a stock engine is too big. I have 3" all the way back to my muffler but I also have 436 cubes.
.
TECH Regular
Joined: Feb 2006
Posts: 434
Likes: 0
From: Winnipeg, Mb
ya 3" is for big blocks or high reving engines. i have 3" on my lt1 it adds hp in the high power band but i'm pretty sure i lose in the lower power band. I like the sound of it though. 2.5 is all you really need. it can support up to like 550hp i think without restricting it and even then im not sure it would. If i'm wrong at all call me on it
