Headers
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Teching In
Joined: Aug 2010
Posts: 28
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Headers Looking at installing Thorley headers this weekend onto my gxp and I have a few questions. How many people here have installed them themselves vs taking them into a shop to get it done. Also how difficult is the install on a whole, and the weld at the end. my last question is is it better to reuse the factory gasket or replace it with a multilayer bi-metal gasket
4-6 hr install. reuse your gaskets and be prepared to get hacked off at reinstalling the trans dipstick tube bolt. the collector will need to be welded to the cat. if your cattless then shops wont touch it.
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Staging Lane
Joined: Feb 2010
Posts: 71
Likes: 0
From: Kyle, Texas
Wow, 4-6 hours! Apparently I suck at installing headers. Took me about 12 hours over two days, I just used ramps to lift the car up. The best part was driving the car to get the rest of the exhaust welded on at Fritz's muffler shop in San Marcos TX.
short clip
http://www.youtube.com/watch?v=TSwkhczvsic
short clip
http://www.youtube.com/watch?v=TSwkhczvsic
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I had her on all 4 in the air,wasnt that bad of install just time consuming(beer and smoke breaks),open header to the muffler shop put a 
on my face.Here are a few pics when i did mine(sorry cell phone pics)
http://s678.photobucket.com/albums/v...headers%20LS4/
on my face.Here are a few pics when i did mine(sorry cell phone pics)http://s678.photobucket.com/albums/v...headers%20LS4/
yep took me about 5 hrs. The only thing i did different from what the instructions said if i remember right is it says to slide the rear header in from the top past the valve cover but i found it easier to just slide it in from the bottom. also open headers to the exhaust shop was awesome.
