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I'm looking at replacing my single stock muffler with duals.

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    I'm looking at replacing my single stock muffler with duals.

    On a Grand Marquis 1999.

    What FlowSound Muffler will fit my application?

    http://stores.ebay.com/The-Race-Part...34Q2ec0Q2em322 These are flowmaster knockoffs. Flowmaster lost their patent to the 40 series. You can get some awesome deals on aftermarkets.

    I'm asking because I don't know if there's a offset I need to look for.

    Last edited by Toxicadam; 02-14-2010, 10:52 AM.

    #2
    Oh wow good prices on those. That was one things i didnt like about flowmasters, next to the fact that they flow like crap, is that they are like $85/ea. They even have the single chamber on there (I think its the 10 series).

    What exactly are you looking to do with your exhaust? That will be a large factor in what fits and what doesnt.

    Do you have duals? Do you want duals? Just swapping the stock muffler?
    1998 Mercury Grand Marquis 131k~ true duals, 2nd cat removed, H-pipe, Xcelerator Turbo mufflers, PI Manifold, 180* Tstat, K&N drop-in.
    1985 VW Vanagon 70k~

    Comment


      #3
      Originally posted by DriverSideImpact98 View Post
      Do you have duals?
      No.

      Do you want duals?
      Yes.

      Just swapping the stock muffler?
      No.

      What exactly are you looking to do with your exhaust?
      I want to upgrade for better sound and performance. Not too loud.. Would the 40 series fit these requirements?

      Do Grand Marquis 99 have any offsets? Like do the pipe inlet or outlet need to be centered on the muffler?

      And for clarification, the stock pipes are 2"?
      Last edited by Toxicadam; 02-14-2010, 12:08 PM.

      Comment


        #4
        You need a h-pipe for starters. You can either get one from the junkyard or get a new one. I got a new one from Advance Auto for $74. The manufacturer was Walker.

        It is 2" stock.

        You will need to get 2 pieces of straight 2" pipe. I think they're around 12-18". You need these because the stock mufflers are so long, that when you replace it with aftermarket ones that are usually not as long, you have to make sure they are back far enough so that the over-axle pipes don't rub on the axle or other things.

        You will also need a left over-axle non-resonataor pipe. Once again, j-yard or new. My Walker piece was only $27 brand new at Advance Auto. You will need a bracket for that side too. I got mine from a CVPI.

        You may need to weld a bracket or hanger to help support the mufflers.

        I just did all of this in November.


        Hope this helps.

        -ryan s.
        08 Lincoln Navigator L - 233k
        03 Mercury Marauder- 63k
        97 Ford Crown Victoria HPP "Tank of Justice III" (TOJ3) - 194k -->578.9 miles on ONE tank of gas<--
        94 BMW 325i Convertible - 135k
        73 VW Super Beetle "Bunky" <----- Wifey's
        12 Mini Cooper S - 90k <---- Wifey's
        Originally posted by pantera77
        Well my buddy tells him he knows exactly who loves buying shitboxes.

        Comment


          #5
          Thanks man! This helps a lot

          Comment


            #6
            Yeah what SVT98 said. As far as the 40 Series. They are pretty loud. probably some of the loudest mufflers you can get. (i think the flowmaster 10 series and SLP LM 2 are the loudest)
            1998 Mercury Grand Marquis 131k~ true duals, 2nd cat removed, H-pipe, Xcelerator Turbo mufflers, PI Manifold, 180* Tstat, K&N drop-in.
            1985 VW Vanagon 70k~

            Comment


              #7
              You could try and find a cop car exhaust as well .. I have dual exhaust on my car now, im running the h-pipe, using 2 inch piping. I bought 2.5 inch, offset inlet and centered outlet thrush welded and they have a nice growl to them.
              79 Grand Marquis

              Comment


                #8
                This thread is relevant to my interest in dual exhaust.

                Would I be able to replicate the appearance of the dual straight pipes of a Marauder on a GM?
                '01 Mercury Grand Marquis GS 4.6L
                '01 Ford Mustang GT 4.6L

                Comment


                  #9
                  Yes. And just some food for thought, the original exhaust systems on these cars were stainless so if you are looking for a direct fit with stock sound a J yard will be a good place to find a whole system with hangers and such. Other wise chances are if you just add a non stock pipe and H pipe to make the duals in a about a few years you will have single exhaust again but with a major leak. This also depends on where you live though.

                  Comment


                    #10
                    You can buy the tips at www.innovativeinterceptors.com

                    Thats where i bought the 4" tips for the Marauder. I put the old Marauder tips on my 93. The whole set up sounds great. You can... never mind. I was going to tell you about everything you should get, but i just realized i did that in post #4. Any questions, ask!
                    You can see some of the pics in my Tank profile using the link in post #4.

                    Ask away!!

                    -ryan s.
                    08 Lincoln Navigator L - 233k
                    03 Mercury Marauder- 63k
                    97 Ford Crown Victoria HPP "Tank of Justice III" (TOJ3) - 194k -->578.9 miles on ONE tank of gas<--
                    94 BMW 325i Convertible - 135k
                    73 VW Super Beetle "Bunky" <----- Wifey's
                    12 Mini Cooper S - 90k <---- Wifey's
                    Originally posted by pantera77
                    Well my buddy tells him he knows exactly who loves buying shitboxes.

                    Comment


                      #11
                      Nice1 SVT. Yeah I want my GM to look just like this.



                      Is it me of does that rear bumper cover have a bit of a cut out/taper for the pipes?
                      '01 Mercury Grand Marquis GS 4.6L
                      '01 Ford Mustang GT 4.6L

                      Comment


                        #12
                        It does. They all should have that cut out, regardless if it's dual or not. so....
                        Here's with the stock 3.5" resonators...


                        And here's with the 4" resonator-deletes (Res-deletes).....



                        Here's the stock 3.5" ones from my Marauder on my Tank...



                        Just remember, they are 26" long....


                        I like the way they look on that Merc in the pic. Hope this helps!!!
                        And good luck! There's nothing like the rumble that a freer-flowing exhaust creates!!!

                        -ryan s.
                        08 Lincoln Navigator L - 233k
                        03 Mercury Marauder- 63k
                        97 Ford Crown Victoria HPP "Tank of Justice III" (TOJ3) - 194k -->578.9 miles on ONE tank of gas<--
                        94 BMW 325i Convertible - 135k
                        73 VW Super Beetle "Bunky" <----- Wifey's
                        12 Mini Cooper S - 90k <---- Wifey's
                        Originally posted by pantera77
                        Well my buddy tells him he knows exactly who loves buying shitboxes.

                        Comment

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