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Old Sep 4, 2010 | 09:09 AM
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D J Real's Avatar
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Default Thorley Questions
Just pick me up some brand new thorley's that came yesterday . I was wondering you guys that have them did use re use your stock gaskets or buy new ones? If you bought new ones whare did you get them from?

Thanks in advance

Brendon
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Old Sep 4, 2010 | 09:30 AM
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i used my old ones.
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Old Sep 4, 2010 | 10:02 AM
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the directions say to use the ones that are on there now.
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Old Sep 4, 2010 | 10:25 AM
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My car has 29,XXX miles on it and I went ahead and bought new,so I would not have any problems with leaks...I payed $40 for new one @ the dealership...
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Old Sep 4, 2010 | 11:37 AM
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where is everyone getting them brand new?
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Old Sep 4, 2010 | 11:48 AM
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I went with these. No leaks...

http://www.summitracing.com/parts/SCE-4119/

-Mike
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Old Sep 4, 2010 | 11:51 AM
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Summit here you go this if for the 5.3
http://www.summitracing.com/parts/FE...2467/?rtype=10
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Old Sep 4, 2010 | 12:17 PM
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#12617944 -Exhaust Manifold gasket for most V8 LS applications fits LS1, LS2, LS3, L76, and L92. SOLD AS A SINGLE
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Old Sep 4, 2010 | 05:14 PM
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change the flex pipe if you don't want the whistle noise.
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Old Sep 4, 2010 | 05:31 PM
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Originally Posted by williamGT
change the flex pipe if you don't want the whistle noise.
yes. I did this before i put mine on. From what i have herd im glad i did
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Old Sep 4, 2010 | 11:04 PM
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I used the stock gasket and I have 85k on mine.
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Old Sep 4, 2010 | 11:53 PM
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Originally Posted by monte_with_a_LS4
yes. I did this before i put mine on. From what i have herd im glad i did
sorry kinda of a noob question, but when you guys can change it, for what a bigger one?
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Old Sep 5, 2010 | 11:37 AM
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Originally Posted by D J Real
sorry kinda of a noob question, but when you guys can change it, for what a bigger one?
Same size.

You can read about it here: https://ls1tech.com/forums/ls4-front...whistle-4.html
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Old Sep 5, 2010 | 01:06 PM
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Vibrant flex pipe# 45666, I have mine for sale, never been used I sold the GXP.
$40.00 shipped.
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Old Sep 7, 2010 | 10:32 PM
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I actually have another question, my brother who owns a f-body saids these headers won't fit with my down pipe from hogan? any truth to that?
Last edited by D J Real; Sep 7, 2010 at 10:57 PM.
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Old Sep 7, 2010 | 10:38 PM
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You will have to shorten the mid-pipe (downpipe) and weld them together. Or flange them and bolt em together.
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Old Sep 7, 2010 | 10:58 PM
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Originally Posted by LS4SPEED
You will have to shorten the mid-pipe (downpipe) and weld them together. Or flange them and bolt em together.
by how much?
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Old Sep 7, 2010 | 11:21 PM
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Sorry I don't recall. Do a search and you will find your answer.
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Old Sep 8, 2010 | 02:44 PM
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Ok after reading all this my plan of action is to install the headers (use new gaskets from summit) remove "y"section, cut out old flex, weld in new flex, replace 3" of pipe(stainless) to top of flex, where it connects to the crossover and reinstall upgraded "y"pipe. Now does that sound right to anyone? And now I have another question. At what point can i reattach the hogan to the headers? I know the thorey has a downpipe that is suppose to go all the way to cat but i want to keep the hogan as much as possible.
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Old Sep 8, 2010 | 02:47 PM
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i would just leave the hogan off and sell it.
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