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  #1  
Old 01-12-2016, 09:54 PM
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Doug Thorley Tri-Y WJ Headers

So much want...

Long Tube Tri-Y Headers, 1999-04 Jeep Grand Cherokee WJ, 4.7L – Doug Thorley Headers

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Old 01-24-2016, 09:22 PM
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Re: Doug Thorley Tri-Y WJ Headers

Dam!
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  #3  
Old 01-24-2016, 09:42 PM
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Re: Doug Thorley Tri-Y WJ Headers

Yup... I wonder how much work it would take to make them pass emissions??

I Had MP/Thorley headers on the 1994 Dakota with the 5.2/auto/3.55 gears. Added the M1 intake and MP computer for a fun little truck.
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Old 01-24-2016, 09:42 PM
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Re: Doug Thorley Tri-Y WJ Headers

Not much
Some engine tuning or extra cat
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Old 01-24-2016, 09:49 PM
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Re: Doug Thorley Tri-Y WJ Headers

Quote:
Originally Posted by hoffmanestates View Post
Not much
Some engine tuning or extra cat
If it was not my daily I would think seriously about it.
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File Type: jpg THY-637Y-C_HEADERS_1024x1024.jpg (112.8 KB, 12 views)
File Type: jpg THY-637Y-C_YPIPE_1024x1024.jpg (91.3 KB, 7 views)
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Old 03-25-2016, 01:24 PM
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Re: Doug Thorley Tri-Y WJ Headers

I want a set of these.
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Old 03-25-2016, 01:25 PM
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Re: Doug Thorley Tri-Y WJ Headers

Buy eeemmmm
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Old 04-21-2016, 02:02 PM
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Re: Doug Thorley Tri-Y WJ Headers

Busted a couple holes in my fed spec wj y pipe wheeling and the exhaust hanger ripped off and left another hole so, these were just ordered !! Just wondering if anyone else is running them ?

http://www.coloradospeed.com/headers-connection-pipes-c-1785_3474_3491/doug-thorley-421-long-tube-headers-158-19992004-grand-cherokee-47l-p-39536.html
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Old 05-12-2016, 08:38 AM
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Re: Doug Thorley Tri-Y WJ Headers

I wonder how the emissions work without the upper mini cats, would a cell be triggered?

How much work to install these?
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Old 05-12-2016, 08:40 AM
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Re: Doug Thorley Tri-Y WJ Headers

Probably. But if you have a tuner he can fix that.

Or if u get the o2 extender that might help
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Old 06-05-2016, 01:44 PM
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Re: Doug Thorley Tri-Y WJ Headers

I recently installed these on my Grand when I replaced the motor. They are a tight fit but do not rub anywhere. I had to modify the Y pipe to fit my application as I already installed the PML deep pan for the trans. I used a plennishing hammer bit in an air chisel and massaged the pipe to clear the pan. Right where the Y pipe bends around the front right corner of the pan, I had to dent in a 1/2" x 2" section. It worked out fine. The 02's bolted in without having to lengthen the wires, I had to reroute them so the wires didn't touch anywhere and reached where they needed to go. Scanned it, cleared the codes and have had no issues yet. Got about 125 miles on new motor since swap, runs great, sounds wicked. Also swapped in the '08 intake and am awaiting the 70mm throttle body from F&B. Very happy with the headers, they appear to be excellent quality, the fit and finish is superb, kit comes with nice gaskets and stainless hardware. All in all a good upgrade, in my opionion, despite the cost.
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  #12  
Old 06-05-2016, 03:15 PM
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Re: Doug Thorley Tri-Y WJ Headers

Quote:
Originally Posted by GrandHO View Post
I recently installed these on my Grand when I replaced the motor. They are a tight fit but do not rub anywhere. I had to modify the Y pipe to fit my application as I already installed the PML deep pan for the trans. I used a plennishing hammer bit in an air chisel and massaged the pipe to clear the pan. Right where the Y pipe bends around the front right corner of the pan, I had to dent in a 1/2" x 2" section. It worked out fine. The 02's bolted in without having to lengthen the wires, I had to reroute them so the wires didn't touch anywhere and reached where they needed to go. Scanned it, cleared the codes and have had no issues yet. Got about 125 miles on new motor since swap, runs great, sounds wicked. Also swapped in the '08 intake and am awaiting the 70mm throttle body from F&B. Very happy with the headers, they appear to be excellent quality, the fit and finish is superb, kit comes with nice gaskets and stainless hardware. All in all a good upgrade, in my opionion, despite the cost.
The o8 intake manifold a worth while upgrade by its self?

You can run 99 cobra injectors for more stability
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