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Doug Thorley Problems

Discussion in '4 Cylinder' started by Bosmob, Jul 3, 2012.

  1. Bosmob

    Bosmob [OP] Well-Known Member

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    Kevin
    San Diego, CA
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    '11 Access Cab SR5 I4 4AT
    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    Hey I just installed a Doug Thorley header on my 2011.

    I encountered some problems that The Truck Shop in SD helped me out with.

    1. The Air Switching Valve contacts the header air tubes to the point where they are almost one piece and unmovable.

    2. The Intake Pipe Insulator was nowhere near bolt on ready and had to be heated up and bent.

    3. There is an exhaust leak where the Intake Pipe Insulator bolts up to the header but I am going to address that tonight.


    Has anybody else encountered these problems?:confused:
     
  2. Steves104x4

    Steves104x4 Well-Known Member

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    Buffalo NY
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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    #'s 1 and 2 were problems I had. Had to grind bottom of valve to clear pipe which left a hole that had to be aluminum welded from inside of valve after having to take it apart. I didn't want to heat and bend the air pipe in case it should of weakened and cracked. The brownish goop is where it was touching the underside of valve.

    Photo0364.jpg
    Photo0365.jpg
     
  3. Bosmob

    Bosmob [OP] Well-Known Member

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    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    dang Doug Thorley is blowing it!

    The air pipe seemed like it was thick enough to withstand some heat and bending. Mine is going to have to be bent again cause there is a massive gap that was causing the truck to sound like a tractor.

    How did you address #2?

    Did you reuse all the factory gaskets? Did you use copper coat on the big manifold gasket?
     
  4. Steves104x4

    Steves104x4 Well-Known Member

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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    Perhaps #1 was our only problem but I do recall another slight problem ( i beleive what you are referring to. It was two years ago we installed it ( I can barely remember what I had for breakfast) Yes, we copper gasketed everything with the stock gaskets. [​IMG]

    Photo0366.jpg
     
  5. Bosmob

    Bosmob [OP] Well-Known Member

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    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    I'm going to have to grind down my air switching valve as well.

    Do you remember how thick the material is before you had to weld it?
     
  6. tacobo670

    tacobo670 if you have to ask, u can't afford it

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    Super cherry n some champion stuff on the side
    .... y not just return it to DT n tell them of ur problems??? y ruin a perfectly good set of headers n have to hack up ur shit to get'em to fit?? if it was me, id send them back, tell DT to do more R&D n get that shit right! IMO. when i put mines on, only thing i had to "fab" was i stacked washers for spacers onto the mount that holds the header in location from the tranny.
     
  7. Bosmob

    Bosmob [OP] Well-Known Member

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    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    I bought the headers through a reputible local shop. The owner said the Doug Thorley isn't very good to deal with and every header his shop installs has to be modified to fit. We already modified the air pipe to fit but the header cannot seal tightly against the head because the air switching valve.

    I highly doubt that Doug Thorley will be of any assistance but I will try.
     
  8. tacobo670

    tacobo670 if you have to ask, u can't afford it

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    Super cherry n some champion stuff on the side
    O well, already started cutting huh? Can't go back now! Lol
     
  9. n0ms

    n0ms Well-Known Member

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    Celica seats, Icon in rear and front with icon ucas, omd leaf springs, deckplate mod, lce header, Tundra brake swap.
    This is new to me ,have not read anything bad about DTs for the older 4bangers.
    Was planning on getting some soon since lce stop making pipes for mine.
     
  10. BlackSeven

    BlackSeven Grab your helmet, this shits about to get retarded

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    Maryland
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    Toytec Ultimate Lift kit, Toytec Rear AAL, 4.88 Gears, ARB Rear locker, Doug Thorley header, Volant Cold Air Intake, Demello Offroad front high clearance bumper, ARB On board Air compressor, BLHM, Wet Okoles, 2011 Color matched grill, Weathertech mats, 4x Innovations Sliders, ATO Engine Skid plate, ATO High lift bed mounts.
    I can honestly say I had no problems aside from one of the bolts from the header to the cat pipe being frozen and having to cut it off (with only 5000 miles on the truck !?). I honestly felt everything in the kit bolted up and worked really well. I've got about 8k miles on the header and I'm happy.
     
  11. Bosmob

    Bosmob [OP] Well-Known Member

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    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    Well, I returned my 1st header to DT in July, 3 months ago!:mad:

    I received a new one in the mail this week and I just got done installing it. The header bolts up to the head correctly and the Insulator Pipe bolts up to the Air Switching Valve nicely(this was the previous problem). But the midpipe doesn't seal properly with the header. I can feel exhaust gases puffing out through the gap.

    I'm going to try to see what I can do about it tomorrow but DAMN! I'm really despising Doug Thorley right now!


    Has anybody else ran into this problem?
     
  12. BlackSeven

    BlackSeven Grab your helmet, this shits about to get retarded

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    Toytec Ultimate Lift kit, Toytec Rear AAL, 4.88 Gears, ARB Rear locker, Doug Thorley header, Volant Cold Air Intake, Demello Offroad front high clearance bumper, ARB On board Air compressor, BLHM, Wet Okoles, 2011 Color matched grill, Weathertech mats, 4x Innovations Sliders, ATO Engine Skid plate, ATO High lift bed mounts.
    You need to replace the graphite doughnut gasket inbetween the header and midpipe. This is not included with the header, mine was in good shape so I was able to reuse it. But it does say in the DT install instructions that you may need to buy a new one.
     
  13. Bosmob

    Bosmob [OP] Well-Known Member

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    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    I know that it's probably a good idea to use a new donut but I know that it won't fix the problem. The 2 flanges that meet up aren't equal all the way around. The gap is really tiny on one side and enormous on the other side.

    I tried loosening up the midpipe to the first cat and twisting the midpipe but it wouldn't budge. Then I tried using a jack to support the cat and a pair of vise grips to clamp the flanges together and bolt them down. But as soon as I released the vise grips and jack, the gap opened up again.:mad:

    It is almost like the flange was welded on the header a bit crooked!

    Anybody have any suggestions?
     
  14. maxpower29

    maxpower29 Well-Known Member

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    All season mats, 2nd filter delete, DT header, Jardine cat-back, URD shifter, Bilstein 5100's all around at .85 front with Eibachs + .25 passenger/.5 drivers spacers and 1.5 AAL, 0w20 synthetic, Scanguage II, extra D rings, OEM backup camera+Mirror, bed mat, Extang Solid Fold, Popnlock 5300, Pro Comp 7089's 4.5bs 285/70/17 Revo 2s, De-badged
    Oh dear god, I just got my 2nd one that was shipped with out yours and am installing it tomorrow.......you have me worried already. I will fucking lose my shit if it doesnt fit.
     
  15. Bosmob

    Bosmob [OP] Well-Known Member

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    Fat Bob's 2.75" front spacers Magnaflow Muffler Doug Thorley Header ImMrYo Mirror Bracket
    I have removed and installed my exhaust manifold on my truck a total of 7 times already.

    The 3rd header is being sent out to me and I will see if that finally fits. This whole ordeal has taken about 3 months.
     
  16. maxpower29

    maxpower29 Well-Known Member

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    All season mats, 2nd filter delete, DT header, Jardine cat-back, URD shifter, Bilstein 5100's all around at .85 front with Eibachs + .25 passenger/.5 drivers spacers and 1.5 AAL, 0w20 synthetic, Scanguage II, extra D rings, OEM backup camera+Mirror, bed mat, Extang Solid Fold, Popnlock 5300, Pro Comp 7089's 4.5bs 285/70/17 Revo 2s, De-badged
    I know what yyou mean. I originally ordered my header in March
     
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