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ls1 with no muffler or cats

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Old Aug 2, 2010 | 01:05 AM
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Default ls1 with no muffler or cats

I just about finished swaping a ls1 into my 73 vette. My questions is that. Right now I have block hugger headers then plan to run into custom side pipes . Which feed from a 3" collector then to 4" side mount pipes .will running straight pipes with no cats or muffles will it hurt the motor? Thanks
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Old Aug 2, 2010 | 01:42 AM
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Nope. If it's not tune for the open exhaust it could run lean as ****! We did straights on a 1984 suburban we swapped a 6.0 in. A/F jumped up to like 16:1
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Old Aug 2, 2010 | 02:03 AM
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nope just like he^ said make shure ur tune is spot on
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Old Aug 2, 2010 | 02:27 AM
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gonna be loud as **** tho.
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Old Aug 2, 2010 | 09:38 AM
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Originally Posted by brian_rs/ss
gonna be loud as **** tho.
Hell yeah, I have a friend with an older Vette, I think its a 63 or so, with side pipes, he has glasspacks, but its still extremely loud like a motorcycle. Sounds classy though...
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Old Aug 2, 2010 | 10:44 AM
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Thanks for all the responses. I guess i wouldnt be to worried about running open pipes for a little while. Iam sure ill get tire of fast..

All the pipe comes in today hopefully ill have it done with video for sound.
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Old Aug 2, 2010 | 01:44 PM
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Originally Posted by LS1WS6dreamer
like a motorcycle. Sounds classy though...
wow, uhhh, no.
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Old Aug 2, 2010 | 01:52 PM
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its going to sound aweful...

lsx engines sound terrible with straight pipes
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Old Aug 2, 2010 | 01:58 PM
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i would atleast run a glass pack, or something.

this is my 5.3 with high flow cats & no muff. i will be changing the exhaust as soon as i get my headers.




http://www.youtube.com/watch?v=ZSRVhuneiug
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Old Aug 2, 2010 | 02:11 PM
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I am running longtubes, no cats and a cutout before the muffler (basically straight pipes) and it's not hurting anything but yes, sounds like doo-doo.
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Old Aug 2, 2010 | 08:01 PM
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My exhaust came it.
4" custom side pipes..



seeing how they fit

lol
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Old Aug 2, 2010 | 08:04 PM
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yea it sure will be loud and it might not sound that good but it wont hurt anything.
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Old Aug 2, 2010 | 09:11 PM
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Originally Posted by meinthe73
seeing how they fit

lol
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Old Aug 10, 2010 | 06:28 PM
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just a follow up .
i got both sides mocked after this picture and damn it is really loud.

heres a teaser of the side pipes
(the smoke is off the head burning the coating)
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Old Aug 10, 2010 | 10:08 PM
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seriously.... LSX's sound like *** with no mufflers. You'll hate it.
Cool build, though!
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Old Aug 11, 2010 | 12:10 AM
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Originally Posted by Steve Gunn
seriously.... LSX's sound like *** with no mufflers. You'll hate it.
Cool build, though!
Yeah they do, I took my mufflers off today to swap them and started it up with an open x-pipe and it sounded kinda nasty. It sounded nice at idle, but revved up it was loud, raspy, and unrefined. Is that the aluminum block that does that? Makes it more metallic, high-pitched, and raspy sounding?
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Old Aug 11, 2010 | 07:51 AM
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Originally Posted by X-ray
Yeah they do, I took my mufflers off today to swap them and started it up with an open x-pipe and it sounded kinda nasty. It sounded nice at idle, but revved up it was loud, raspy, and unrefined. Is that the aluminum block that does that? Makes it more metallic, high-pitched, and raspy sounding?
That, and a different firing order than a SBC
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Old Aug 11, 2010 | 09:39 AM
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Originally Posted by 01ssreda4
wow, uhhh, no.
lmfao
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Old Aug 12, 2010 | 04:18 AM
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Originally Posted by X-ray
Yeah they do, I took my mufflers off today to swap them and started it up with an open x-pipe and it sounded kinda nasty. It sounded nice at idle, but revved up it was loud, raspy, and unrefined. Is that the aluminum block that does that? Makes it more metallic, high-pitched, and raspy sounding?
no it's the flow dynamics of the heads. look at the intake ports on lsx heads compared to sbc or sbf heads. basically they flow like crazy
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Old Aug 12, 2010 | 07:49 AM
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An exhaust hanger broke and then a muffler came off at the track last night. Luckily it fell off on the return lane, so I just got out and kicked it off to the side and then picked it up and put it in my trunk later. But damn did it sound good with one on and one off. Funny how it didn't sound good with both off though. Had to be real light on the throttle driving home from Cecil at night though lol.
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