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Unread 12-08-2009, 07:43 AM   #1
EisBlade
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Doug Thorley Headers 4.0L - PICTURES!!!

(pics are stored in My Gallery, larger hi-rez photos are pulled from Box.net)

I've had a lot of requests by those knowing these were on the way. Here are pictures of the Mike Leach designed Doug Thorley Header for the 1999-2001 inline 6, 4.0 engine (read: two 02 sensors)(02 - 04 require four 02 sensors. Contact kolak@aol.com for more info). Borrowing Kolak's words for best description:

"This is a tri-Y (3 collector) design, and it really makes a big power difference with a very broad powerband and excellent power and torque gains across the rpm range. This header has a lifetime warranty, and uses 14 gauge tubing with 1/2" laser cut flanges -- the heaviest in the industry. The header is ceramic coated inside and out, a particular benefit for the I6 engine. The coating radically reduces radiated heat into the engine compartment, and given the close proximity of the I6 intake manifold, much cooler intake air will result. That means more power and excellent detonation resistance. The ceramic coating also eliminates worries about header cracking. There's a lifetime warranty on the coating as well."

Clayton's are to long arms what Thorley is to headers; and the shiznit at a whopping $499 apparently. LOL

The box arrived yesterday and hi-rez photos have successfully uploaded. Files are large so I'm posting links instead. Click, select to Download, then choose from there whether to save locally or open. Enjoy.

Header Box Contents.......................................... .........................................CloseUp 1


CloseUp 2................................................. .................................................C loseUp 3


CloseUp 4................................................. .................................................. .....CloseUp 5



Hi Resolution - larger than above (2.5-3.5Mb size)
Doug Thorley Header-box contents
Doug Thorley Header-closeup1
Doug Thorley Header-closeup2
Doug Thorley Header-closeup3
Doug Thorley Header-closeup4
Doug Thorley Header-closeup5

Hi Resolution - the Mack Daddy's, for high-speed download (8Mb ea)
Doug Thorley Header - box contents
Doug Thorley Header - header closeup 1
Doug Thorley Header - header closeup 2
Doug Thorley Header - header closeup 3
Doug Thorley Header - headers closeup 4
Doug Thorley Header - header closeup 5
Doug Thorley Header - header closeup 6

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Last edited by EisBlade; 01-26-2010 at 06:47 PM..
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Unread 12-08-2009, 07:54 AM   #2
rm2001wj
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Those will be great for those who only have two O2 sensors. Those with four O2 sensors won't be able to use them.
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Unread 12-08-2009, 08:11 AM   #3
Kolak
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Thorley has a specific header for those with four O2 sensors.

Jean - I am so glad they arrived! I never did hear from Thorley with tracking despite my repeated requests. Guess I can stop asking them now
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Unread 12-08-2009, 08:34 AM   #4
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WHY are they clicky! CLicky Bad we hate clicky!

Use photobucket 8.1MB a picture isnt fun.
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Unread 12-08-2009, 09:38 AM   #5
gatorayde
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X2 ^

I did check the first pic out though
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Unread 12-08-2009, 01:06 PM   #6
trailblaze
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nice headers!

i put a set on my old XJ. not that brand though.... i didn't really notice any performance gains. i thought it was a waste of money.
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Unread 12-08-2009, 01:24 PM   #7
JrMechanic
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Just a pet peeve of mine, when referring to a 4 cylinder or I6 engine, it's HEADER, not HEADERS. There is only ONE header.

Looks good, not $500 good though.
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Unread 12-08-2009, 03:55 PM   #8
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Quote:
Originally Posted by JrMechanic View Post
Just a pet peeve of mine, when referring to a 4 cylinder or I6 engine, it's HEADER, not HEADERS. There is only ONE header.

Looks good, not $500 good though.
FALSE. In stock configuration on a 4.0L WJ it has a two headers. One for the first three cylinders and one for the other three cylinders.
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Unread 12-08-2009, 07:51 PM   #9
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Which have two O2's and which have 4?
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Unread 12-08-2009, 08:28 PM   #10
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only had patience to click on 1st one (no click?!?!?) but they are nice.
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Unread 12-08-2009, 08:55 PM   #11
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Quote:
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FALSE. In stock configuration on a 4.0L WJ it has a two headers. One for the first three cylinders and one for the other three cylinders.
OWNED.
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Unread 12-08-2009, 09:23 PM   #12
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So, you do know you have to do a before and after dyno to show the HP and TQ gains from these headers right???? Are you still running the stock exhaust right now?
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Unread 12-08-2009, 11:05 PM   #13
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Quote:
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So, you do know you have to do a before and after dyno to show the HP and TQ gains from these headers right???? Are you still running the stock exhaust right now?
not everybody has access to a dyno theres not one with in 50miles of my location lol.
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Unread 12-08-2009, 11:09 PM   #14
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Quote:
Originally Posted by CMARJEEP View Post
FALSE. In stock configuration on a 4.0L WJ it has a two headers. One for the first three cylinders and one for the other three cylinders.

FALSE. For one, it's an exhaust manifold, not a header. Two, it's still one assembly as it uses the same collector, making it one exhaust manifold.
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Unread 12-09-2009, 06:35 AM   #15
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I would call it headers, its tubular. My 2000 has two separate 3 into one "headers" that each have their own collector (ball joint) and then a two into one pipe bolted to that.
http://www.rockauto.com/catalog/moreinfo.php?pk=539501
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