Single 3"?
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On The Tree
Joined: Jun 2005
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From: Fort Worth, TX
Single 3"? Will a single 3" pipe be enough to give me 350hp at the wheels or will I need something more free flowing? I have a '01 LS1 with Hooker long tubes into a 3" Y with a single 3" cat and a magnaflow muffler. I'm looking to make 350hp at the wheels, will this exhaust setup give me enough flow or will I need to go to duals, or cutouts, or...? The reason I like it now is it's pretty quiet and it's my daily driver/trip car so I don't want it super loud. Any help is appreciated.
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Thread Starter
On The Tree
Joined: Jun 2005
Posts: 118
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From: Fort Worth, TX
Oh yeah, mods, sorry. It'll have the hooker longtubes, underdrive pulley, cone filter, 12lb flywheel, and a tune. M6 with 3.42 gears, this is in my '85 Celica by the way. 
Thanks for the info, and will the single 3" cat restrict it? I have room to move it and put one in on either side right behind the headers if needed. I may change my mind later but I'm not really worried about huge amounts of power since the car only weighs 2700lbs and the widest tires I can fit on the back are 275s without doing some serious cutting.
Thanks for the info, and will the single 3" cat restrict it? I have room to move it and put one in on either side right behind the headers if needed. I may change my mind later but I'm not really worried about huge amounts of power since the car only weighs 2700lbs and the widest tires I can fit on the back are 275s without doing some serious cutting. LS1 Tech Stories
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From: Tree-Hugging, Bug eating CALI'
I think dual cats' may offer less restriction.
I've made a bit more than 350 with QTPs, a modded Y-pipe, dual cats', and open Borla. I don't think you'll have a problem with a good tune.
I've made a bit more than 350 with QTPs, a modded Y-pipe, dual cats', and open Borla. I don't think you'll have a problem with a good tune.
A single 3" is good for 375 flywheel before it starts becoming a restriction. A single 4" is good to 660 flywheel before it starts to restrict. I can't remember where i found this info but it also stated dual 3" and dual 4" also. Dual 3" was 750 to 800 plus. Dual 4" was way the f up there.
Thread Starter
On The Tree
Joined: Jun 2005
Posts: 118
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From: Fort Worth, TX
Damn, I guess since I'm looking for 350 RWHP I'll need to get another cat since that's a good bit more than 375 flywheel. I don't think I have enough ground clearance to put a single 4" in but dual 3" should be easy enough to fit. I'm still on the fence about just getting cutouts for when I want a really free flowing exhaust though.