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Old 09-04-2010, 09:09 AM
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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 09-04-2010, 09:30 AM
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i used my old ones.
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Old 09-04-2010, 10:02 AM
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the directions say to use the ones that are on there now.
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Old 09-04-2010, 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 09-04-2010, 11:37 AM
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where is everyone getting them brand new?
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Old 09-04-2010, 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 09-04-2010, 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 09-04-2010, 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 09-04-2010, 05:14 PM
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change the flex pipe if you don't want the whistle noise.
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Old 09-04-2010, 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 09-04-2010, 11:04 PM
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I used the stock gasket and I have 85k on mine.
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Old 09-04-2010, 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 09-05-2010, 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 09-05-2010, 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 09-07-2010, 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?
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Old 09-07-2010, 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 09-07-2010, 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 09-07-2010, 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 09-08-2010, 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 09-08-2010, 02:47 PM
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i would just leave the hogan off and sell it.
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