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Old 09-06-2007, 10:21 PM   #1
jahl7787
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Default Can an sti muffler be welded to 3" piping?

I am running 3" turbo-back right now, and my question is can my 3" piping have an sti muffler welded to it? I know the stock sti piping is smaller, so is there an adapter a muffler shop can use to weld 3" pipe to the 2+" outlet on the muffler?

Thanks,

Jeff
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Old 09-06-2007, 11:32 PM   #2
PS_REX
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you can bolt your stock sti catback onto a 3" downpipe as long as its a flat flange.
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Old 09-08-2007, 08:28 PM   #3
jahl7787
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I am just looking at mating the muffler by itself to 3" piping. Meaning I will cut the muffler off and weld it if possible. So can this be done?
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Old 09-08-2007, 09:18 PM   #4
Paranoid Fabrications
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yes, you can cut off the tubing and weld it on. will it flow more? i have no idea, most likly not.

Shane
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Old 09-08-2007, 09:28 PM   #5
jahl7787
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Cool thanks!
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Old 09-08-2007, 09:29 PM   #6
REX8
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Quote:
Originally Posted by jahl7787 View Post
I am just looking at mating the muffler by itself to 3" piping. Meaning I will cut the muffler off and weld it if possible. So can this be done?

Yes, but the more serious question is why???

The 2.4" (actually 2.38") piping is NOT holding anything back. If anything was holding you back (which is most likely not the case), its the muffler itself.

Besides, guess what size the openings are just on the inside of the muffler wall...well....not 3".

If you're doing it for fun, ggo right ahead, but you won't be gaining anything.

It will bolt right up to a 3" flat flange so there's not a real good reason to do it.
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Old 09-08-2007, 09:39 PM   #7
jahl7787
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No I am not trying to gain anything at all. I realize it will lead to more backpressure. My exhaust right now is 3" tb and catless, and I'm running w/ an open muffler an no resonator. Needless to say it's loud as hell and doesn't go so well with my new neighbors. Just trying to quiet it down as much as possible. I should have revised my question as it is not very concise. I mainly just wanted to know if 2.4" piping could be welded to 3".

Thanks,

Jeff
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Old 09-08-2007, 09:45 PM   #8
jma_1000
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so, if you're going to weld the muffler on, you must know a thing or two about welding, in which case you would know if you can mate 2.4" with 3" piping. although its baffling you would go to such lengths, when all you have to do it bolt it to your downpipe (if its flat flanged).

but hey, to each their own, i guess.
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Old 09-08-2007, 09:59 PM   #9
jahl7787
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Dude, no. I will not be welding this myself. I am considering buying a used sti cat-back and cutting the muffler off of it, cutting my cheap, loud 3" open muffler that is currently on my car off, and welding the sti muffler to my existing 3" piping. That is all.
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Old 09-08-2007, 10:31 PM   #10
SKSTI
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Quote:
Originally Posted by jahl7787 View Post
No I am not trying to gain anything at all. I realize it will lead to more backpressure. My exhaust right now is 3" tb and catless, and I'm running w/ an open muffler an no resonator. Needless to say it's loud as hell and doesn't go so well with my new neighbors. Just trying to quiet it down as much as possible. I should have revised my question as it is not very concise. I mainly just wanted to know if 2.4" piping could be welded to 3".

Thanks,

Jeff
Jeff, have you thought of getting the maddad's intermediate pipe?

http://www.daddysscp.com/dcart4/prod...0&cat=0&page=1

It's a really nice piece, allowing you to keep the 3" from the downpipe all the way to the axleback - power without crazy sound.
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