Doug’s D452 headers with tti exhaust?

Mopar Exhaust Systems

  1. 500Hardtop

    500Hardtop Well-Known Member

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    I already have the Dougs headers on the car, and have been assuming that tti will build the exhaust to fit my headers? I talked to a gentleman at tti and he said they don’t do that anymore, and the exhaust matches tti headers, mine will need some fabricating on the drivers side. I did make a “s” bend to temporarily hook up my old exhaust.
    So, has anyone hooked up tti 2.5 or 3 inch H pipe exhaust to Doug’s D452 headers?
    While we’re on the subject, I had to massage #1 tube to clear the torsion bar, and #2 has lightly contacted the shock tower, no big deal on either. Also they discolored breaking in the hydraulic cam, but they warn against this, so my fault. Thanks for any input!

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    • Darter6

      Darter6 FBBO Gold Member FBBO Gold Member

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      TTI pipes gives you extra inches so you can cut to fit. I've never had any X pipe TTI's only H pipe. With 2.5'' you should have plenty of adjustment to fit to the Dougs. Not a fan of 3'' but that's just me. I would think that any long tube headers exit close to the same spot to clear the cross member.
       
    • 500Hardtop

      500Hardtop Well-Known Member

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      Thanks Darter6, the passenger side collector points at the open space in the trans crossmember so its easy, but the drivers side doesn’t angle in enough and points a little too far to the outside of the car and will require a slight curved adaptor fabricated to get the exhaust through the crossmember opening. The car is a 66 Coronet 500. The 2 inch headers are very nice and overall fit very good, but the tti headers would have fit right up to the matching tti exhaust. I’ll get it to fit, was sharing some lessons learned.
       
    • Darter6

      Darter6 FBBO Gold Member FBBO Gold Member

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      Yeah, for some reason the driver side is off on all of them. Most resent is a set of small block Jegs cheapies on a early B.Same thing.
       
    • hunt2elk

      hunt2elk FBBO Gold Member FBBO Gold Member

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      Are your motor mounts new, or in good condition?
       
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      • 500Hardtop

        500Hardtop Well-Known Member

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        Thanks for asking, the motor mounts are new dynatech from 440 source.
         
      • Darter6

        Darter6 FBBO Gold Member FBBO Gold Member

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        ^^^^ Many times fitment problems are because these are old/wore out ! ^^^
        Dang beat me to the punch !
         
      • 500Hardtop

        500Hardtop Well-Known Member

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        I got a tti 3 inch exhaust kit this week. Sorry about the filthy garage floor, it’s where my wife parks her Jeep. The 106 lb box was packaged very nice, with lots of bubble wrap. I’ll post pics as I go, there is already a couple small contact points I’ll have to address, no big deal. And I’ll need to make the adaptors to hook up to the H pipe. Doug’s 2 inch, 3 1/2 collector. The tailpipe on the left is the 2 1/4 accurateltd pipe that was on the car.

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      • 500Hardtop

        500Hardtop Well-Known Member

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        All 4 corners of the gas tank need the points bent up. The hook that holds the gas tank strap needed to be shortened. Overall it’s going together pretty good. I probably won’t get to the header to H pipe adaptors/reducers until next weekend. Be safe!

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        • dave dodge

          dave dodge Well-Known Member

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          Thanks for sharing, I'm considering the the 2.5 h-pipe system on my 67 R/t with hedman headers,3 inch collectors. Wondering if I'll have same problem ?
           
        • 500Hardtop

          500Hardtop Well-Known Member

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          dave dodge, the gas tank corners were easy, the header to H or X pipe adaptors/reducers will have to be fabricated unless your using tti headers and their exhaust, as I understand it? I know on mine the pass side will be easy, relatively straight. The drivers side will need a slight curve from the header towards the inside, then back to the H pipe. Hope this helps.
           
        • dave dodge

          dave dodge Well-Known Member

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          Thanks for the reply, good info.
           
        • 500Hardtop

          500Hardtop Well-Known Member

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          I made the adaptor/reducers today and will finish welding tomorrow. Came out pretty good. Passenger side was pretty straight. Drivers side not so much.

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