2.5" or 3"

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Aug 12, 2007 | 08:10 PM

transamws6_97

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From: Cincinnati, OH

2.5" or 3"

Okay so I'm researching everything I'm gonna need for my true duals but I'm not sure what size pipe to go with? Should I get 3" pipe or 2.5"? For now I'm stock but once I'm out of college most likely I'll get a 383 h/c rebuild. So what do you all think 2.5 or 3

Aug 12, 2007 | 08:32 PM

LT1Falcon

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i was told 2 and a quarter was more than enough for our motors if they are stock so thats what i went with. its probably not gonna make much of a difference as far as performance, but you might notice a sound difference

Aug 12, 2007 | 08:54 PM

87lt1rx7

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I am no expert but i have much experience with small blocks and have found 3" is preffered if going with big h/c setup. 2.5 is good though. 2.25 would work but if you plan on building the engine up later, do the exhaust once and do it right

Aug 12, 2007 | 09:09 PM

camar0corey

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From: Spring Hill, FL

Isn't that the truth, I'm about to change my exhaust for the 3rd time.

I've heard dual 2.5" is plenty flowing, that is would be comparable to a single 4".

Aug 12, 2007 | 09:12 PM

96lt1m6

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From: LA$ VEGA$

i have 2.5" true duals with an x-pipe and a stock motor and i lost some bottom-end but its all good,sounds awesome!
i wont be stock for much longer.

Aug 12, 2007 | 09:19 PM

LittleRedZ

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Quote:

Originally Posted by 87lt1rx7

true dual not single, a single 3" is good up to 450 so lets hope youre making more then that with h/c

Aug 12, 2007 | 09:19 PM

LittleRedZ

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Quote:

Originally Posted by transamws6_97

all motor i woulndt go no more then 2.5 duals. I run 3" on mine

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Aug 13, 2007 | 12:42 AM

the_merv

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From: The Beach...

I have a big Cam 402 Stroker, and I plan on goin 3" off the Headers Y'd into 4", then back. I don't have the the room for Duals, otherwise I would go dual 3".

Aug 13, 2007 | 07:28 AM

#10

LittleRedZ

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From: Germantown, MD

Quote:

Originally Posted by socal

2.5" bassanie cat back for ls1 f-body modified to fit 92z w ls2
http://www.bassani.com/auto_search/
http://www.bassani.com/part/5798RS5
click pic for better veiw

i'm sorrry but that just looks hideous, and thats coming from somone that does exhaust for a living.

Aug 13, 2007 | 07:29 AM

#11

LittleRedZ

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From: Germantown, MD

Quote:

Originally Posted by the_merv

I have a big Cam 402 Stroker, and I plan on goin 3" off the Headers Y'd into 4", then back. I don't have the the room for Duals, otherwise I would go dual 3".

you can run dual 3" then 2 mufflers and 2 dumps right before the rear axle. I ran the same system you describe, you have to have 450rwhp+ to be able to need that much exhaust, good luck.