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Mar 19, 2009 | 12:11 AM

WhitePhoenix99

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From: Indiana

True Duals

What are you guys running for pipe diameter? I was planning on going with 3" but I think it might be a bit much for just a bolt-on lt1. Anyone running 2 1'2"?

Mar 19, 2009 | 12:14 AM

tspence45

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From: Monmouth, Illinois

I'm running 2.5". It's more than enough for a bolt-on LT1. I forgot what each piping diameter was good too for power.

Mar 19, 2009 | 12:19 AM

WhitePhoenix99

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From: Indiana

Quote:

Originally Posted by tspence45

I'm running 2.5". It's more than enough for a bolt-on LT1. I forgot what each piping diameter was good too for power.

That's what I was thinking. What kind of an x-pipe are you running?

Mar 19, 2009 | 12:25 AM

tspence45

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From: Monmouth, Illinois

Jegs universal x-pipe. Most people run that or Summit. The kit's exactly the same, and the same price. So, whichever company you'd rather order from, go for it.

Mar 19, 2009 | 01:09 AM

LT1

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From: NorCal

3 inch X pipe from summit, mine is just bolt-on sounds and performs good.

Mar 19, 2009 | 01:16 AM

WhitePhoenix99

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From: Indiana

I've heard the 3" is deeper sounding, I would think it wouldn't be as efficient as 2 1/2" with the power output I'm currently making though.

Mar 19, 2009 | 02:50 AM

hitmanws6

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From: Orange, CA

3 inch piping on true duals is good for over 500 hp for zero loss. it is deeper sounding than 2.5 in

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Mar 19, 2009 | 05:27 AM

camar0corey

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From: Spring Hill, FL

Running 2.5" summit h-pipe.

Mar 19, 2009 | 09:19 AM

#10

myltwon

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From: Palm Harbor, FL

imo 2.5", sounds better, less obnoxious for DDing, and better ground clearance.

A 2.75” (stock) single system is good for a 310hp engine with zero loss…
A 3” Single system is good for a 370hp engine with zero loss…
A 3.5” Single system is good for a 503hp engine with zero loss…
A 4” Single system is good for a 657hp engine with zero loss…
A 2.25” dual system is good for a 457hp engine with zero loss…
A 2.5” dual system is good for a 513hp engine with zero loss…
A 3” dual system is good for a 812hp engine with zero loss…

Mar 19, 2009 | 11:29 AM

#11

hitmanws6

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From: Orange, CA

lol i got mixed up on my measurements

Mar 19, 2009 | 11:55 AM

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StealthFormula

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From: Skippack, PA

I'm running a 2.5" X-pipe. I'm running 2.5" over 3" because my car is lowered and its easier to fab it up real close to the body with that diameter. Either one is way better than a 3" Y-Pipe setup so you can't go wrong.

Mar 19, 2009 | 01:58 PM

#13

WhitePhoenix99

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From: Indiana

Thanks for the info guys, 2 1/2" sounds like my best bet. . hmmm I wonder if my exhaust shop could fab up an x-pipe a little cheaper than a summit or jegs kit. Anybody have a custom x-pipe?

Mar 19, 2009 | 02:23 PM

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1996firebirdformula

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From: Seymour, Indiana

Quote:

Originally Posted by WhitePhoenix99

Thanks for the info guys, 2 1/2" sounds like my best bet. . hmmm I wonder if my exhaust shop could fab up an x-pipe a little cheaper than a summit or jegs kit. Anybody have a custom x-pipe?

Did you go to staples muffler shop in north vernon there? I had a truck done there few years ago for TDs. But they didn't know how much exhaust for formula was gonna be.

Mar 19, 2009 | 02:34 PM

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zlicious94

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From: Troutdale,OR

x2 on stealth's reply cause ground clearance is already a biatch with 2.5"

Mar 19, 2009 | 02:50 PM

#16

WhitePhoenix99

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From: Indiana

Quote:

Originally Posted by 1996firebirdformula

Did you go to staples muffler shop in north vernon there? I had a truck done there few years ago for TDs. But they didn't know how much exhaust for formula was gonna be.

Yeah I get all my exhaust work done there, I've been in there quite a few times with this and my previous car. I havn't had the duals priced yet, I'm gonna wait until I'm closer to being done with the header/converter install. I can let you know how much it costs if you're interested.

Mar 19, 2009 | 02:54 PM

#17

hitmanws6

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From: Orange, CA

Quote:

Originally Posted by WhitePhoenix99

Thanks for the info guys, 2 1/2" sounds like my best bet. . hmmm I wonder if my exhaust shop could fab up an x-pipe a little cheaper than a summit or jegs kit. Anybody have a custom x-pipe?

try the magnaflow x pipe from ws6store