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Single to dual exhaust conversion

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    #16
    Maybe better to write here than create a new topic.

    My GM 09 has single exhaust system. Is it stainless steel ? If I found on junkyard h-pipe and left side from Interceptor, can I use my factory right side to connect it ? Or should I buy all exhaust system from H-pie to the end from Interceptor ? If I use only factory parts I should receive few more HP, but do I lose MPG ?
    Last edited by Atropos; 12-09-2018, 04:39 PM.
    '09 Grand Marquis LS - Light Ice Blue / Medium Light Stone, J-mod, dual exhaust with Magnaflow 11224, PI intake, Marty's tune

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      #17
      Any ‘03+ CVPI system should bolt up to your remaining system. When I did the ‘97, I used a ‘95 CVPI H-Pipe and driver’s side muffler and tailpipe. The passenger side muffler and tailpipe attached to the H-Pipe like factory.

      The bump in power was nice, and most members notice a 1-2 MPG increase after their dual swap.


      My Cars:
      -1964 Comet 202 (116K Miles) - Long Term Project
      -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
      -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
      -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

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        #18
        Use 03+ parts from a CVPI or a dual exhaust Marquis or Vic. The town car will be a few inches too long
        2010 Mercury Grand Marquis LS “The Douche” - 70mm throttle body, P71 airbox, 21mm rear sway bay, dual exhaust, Dodge rims, 89K and counting. 4/2018-
        1966 Ford Thunderbird (390FE) “Fordy McFordface” - engine rebuild No. 3. 11/2016-
        RIP 2005 Buick LaCrosse CXS “Jumba” - gone too soon, 229K. 6/2017-2/2018
        RIP 2001 Chevrolet Tracker LT “Featherbrick” - gone too late, 156K POS. 6/2016-9/2016.
        Sold 2005 Toyota 4Runner SR5 - 198K. 6/2016-4/2018

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          #19
          Thank You Guys !!
          '09 Grand Marquis LS - Light Ice Blue / Medium Light Stone, J-mod, dual exhaust with Magnaflow 11224, PI intake, Marty's tune

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            #20
            One more question - if I would like to instal tailpipes a'la Marauder, are any on market to buy ?
            '09 Grand Marquis LS - Light Ice Blue / Medium Light Stone, J-mod, dual exhaust with Magnaflow 11224, PI intake, Marty's tune

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              #21
              I know there used to be, but I don’t know if anyone still sells them. I know a lot of guys use Impala SS exhaust tips instead. A 2.25” exhaust probably would have to be a custom fabrication if you mean the whole catback though.
              2010 Mercury Grand Marquis LS “The Douche” - 70mm throttle body, P71 airbox, 21mm rear sway bay, dual exhaust, Dodge rims, 89K and counting. 4/2018-
              1966 Ford Thunderbird (390FE) “Fordy McFordface” - engine rebuild No. 3. 11/2016-
              RIP 2005 Buick LaCrosse CXS “Jumba” - gone too soon, 229K. 6/2017-2/2018
              RIP 2001 Chevrolet Tracker LT “Featherbrick” - gone too late, 156K POS. 6/2016-9/2016.
              Sold 2005 Toyota 4Runner SR5 - 198K. 6/2016-4/2018

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                #22
                use the Impala SS tails and cut them down to make room for the right size chrome tips. I don't remember the size of the tips... something like 18 inch long 2.5 inlet and 3 inch outlet... maybe 3.5 outlet. Someone on here with a 'rauder should know the size of the tips.

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