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Doug Thorley Headers Installed! Too Many Pictures! LoL

 
Old 05-22-2012, 07:58 PM
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well I've been playing with my motor for the passed 5 hours n i got the back headers off then i was trying to get them out for about a hour n i called it quits for the day n for some reason i went back and started playing with them again and i was about to call it quits so i smoked a cig n grab them n pulled n they came right out so tomorrow I'm gunna start putting the doug thorley headers tomorrow i know by know that theres not a lot of room but who knows I'm just hoping to god they just slid right in there with no problems wish me luck
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Old 05-22-2012, 08:01 PM
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n after i get them get them I'm gunna put my mangnaflow exhaust system in but that should only take like a hour not even i can't wait to drive
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Old 05-23-2012, 07:47 PM
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I vote to make this "sticky". Great write up
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Old 05-23-2012, 09:01 PM
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Fornt header in back headers in new dip stick in from gm just having trouble getting my cross pipe to fit on my exhaust
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Old 05-23-2012, 09:07 PM
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For got to say got all new plugs n wires putting the back plugs n wires in we're a pain in the @$$ not really the plugs just getting the wires in we're but I dropped a bolt in my motor so to took me 3 hours to get my hand down there n had to get my newfew to get he's hand drop there lol had to payed him 5 bucks n a pack of gym he didn't wanna get he's hand dirty
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Old 05-23-2012, 10:09 PM
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Remember to put some dielectric on the wires and they will pull off easier in the future. Especially for the back ones.
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Old 05-24-2012, 01:47 AM
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The first plugs were on there for 65k n to b honest I don't ever plan on putting my hands back there ever again its way too tight when I'm done with this lol but I know it's Gunna happen agian cuz I pain on putting a ls6 -ls1 or a ls2 in take manifold any suggestions on which one you would put in n I'm Gunna b putting a cartuning turbo in this summer n Gunna wait till I blow the transmission and put new one in or might rebuilt it probably just going to put a new one and might put some nitrous and they're not too sure yet if I'm going to go I'd love to give it a spray or two
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Old 05-24-2012, 04:55 PM
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any ides were i could get my impala tuned in chicago or around the chicago land area???
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Old 07-20-2012, 11:09 PM
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Bump for people who just completed the group purchase.

Last edited by Gripenfelter; 07-21-2012 at 08:08 AM.
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Old 12-17-2012, 02:07 PM
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Default Down Pipe

Nice downpipes. may i ask where you got them?
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Old 01-07-2013, 05:32 PM
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Default Intermediate Pipe.

Dear Sir;

Just want to ask the total length of the Intermediate pipe. May I assume that it is applicable to an 06 Impala SS too, right?

Thank you for your attention.

Edison
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Old 01-09-2013, 01:41 PM
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what is the total length of that intermediate pipe?
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Old 08-06-2013, 10:05 PM
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Just wanted to add to the thread, Cutting the crossover heat shield should allow enough clearnence for those who plan on using these headers with 90MM TB's its tight but fits with no issues NOTE: i also sprayed my collector and headers on the inside with more ceramic paint of the 2000 degree variety. 5 coats, each heat cycled and cured. I did that to cut down on radiant heat. my TB Dosent heat soak nearly as much when i still was stock, so i know this also worked, coupled with my aluminum foil wrap (ghetto but works).




As for the downpipe section, Just remove the trans dipstick, install the downpipe section leave everything loose and reinstall trans dipstick. 5 minute job if that.(Bolt for trans tube hold is 10mm BTW) For the rear rocking the motor foward helps but mainly pulling valve cover gave me all the clearnence i could ever need back there.



on a side note i think dough thorley's design was alright, they couldve thrown in longer primaries, And the crossover tube is retarted to be that high off the trans case but close to the TB. but otherwise great fit and hardware included. my exhaust note didnt really change IMO. I had a full 3' system already with glasspacks. But MPG's are up and allowed me to make some drastic improvements to my tune.
im now pulling 26-27 consistently on 87octane no DOD









and pics of the coating i did after all the heat cycling and curing




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Old 01-27-2014, 01:01 AM
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If anyone is selling a stock front manifold. Plz pm me thanks
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Old 09-15-2014, 07:15 AM
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So just installed my OBX headers yesterday. Where did you guys install your downstream o2. I'm going to have my wideband installed as well. But should the stock downstream one go before the cutout? If I do that then the downstream o2 sensor will be pretty much inches from the upstream o2
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Old 02-07-2016, 10:48 AM
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Hey guys; do Thorley headers + ls6 intake & ls4 tb work?
Sounds like I would need to cut the heat shield on the headers?

Is it recommended to re-coat them after cutting the heat shield?
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Old 03-24-2017, 11:16 AM
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To answer my own question, it's tight when you have an ls6 intake, very tight.
I had have the heat shield on the crossover removed and then the "wedge" that holds it in place cut off. That portion of the crossover under the TB was then wrapped.
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