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    • New E39 M5 S62 V8 rear section exhaust option from Fluid Motor Union - Work of art

      Fluid Motor Union does top notch work as was displayed previously with their amazing attention to detail in their jaw dropping Weistec Supercharged CLK63 AMG Black Series build. This is simply a rear section for the E39 M5 but just look at the quality of the welds and the rear section as a whole especially when compared to the OEM setup. No word on pricing but quality work like this does not come cheap. Fluid Motor Union would likely be able to build a quality exhaust setup like this for anything out there.

      In FMU's words:

      Take a look at our new rear section for the BMW E39 M5:



      This system is made from 309 stainless steel and is fabricated by hand at Fluid MotorUnion in Plainfield, IL. The exhaust is installed by cutting the OEM rear section and replacing it with the FMU piece. Clamps will be included for an air-tight seal, and the FMU kit connects to all the OEM hangers for a perfect fit, just like OEM.




      Instead of using mufflers, the FMU E39 M5 rear section uses one pass-through resonator for each tailpipe. With a typical muffler delete (thatís replaced by straight pipes), the resultant tone is raspy at best, and has a tendency to drone. The FMUís use of resonators in place of the mufflers allows the true sound of the S62 motor to stand out, with the end result being a deeper, more aggressive tone at heavy throttle loads while maintaining a great amount of civility during both start-up and idle.







      This kit is a great idea for those looking for a cheaper alternative than a full exhaust kit, and also for those who are wary of deleting the catalytic converters. We also opted to keep the tailpipe design similar to OEM for that stealthier approach to exhaust modification. It doesnít have to look totally different to sound better. The retail version will come fully polished, as well.









      Thereís also the added benefit of a bit of weight savings, as well. Take a look at the size of these OEM mufflers:







      And now check out the FMU system in the same car:




      Weíve also made a video featuring Mikeís M5, the willing donor for the first copy of the FMU rear section. Aside from the exhaust modification, his M5 is 100% bone stock. No trickery here. Minus the "weight reduction" in the corner of the front bumper from unfortunate contact with what was left of a deer on the highway. Enjoy the video, and let us know what you think:




      Since weíre very proud of our newest product release, the FMU E39 M5 Axle-Back Exhaust, letís share some more pictures of the building process.


      Whenever youíre working on assembling several smaller pieces into one larger piece, being able to visualize the final result is important. Thatís why we lay out all the pieces for the axle-back exhaust in a row on the fabrication table. Or maybe it just makes for a good picture. Itís a mystery! ÖBut itís probably the latter of the two.





      If you saw from the table picture, we pre-weld the tailpipes and the Y-pipe (prior to the double-resonator setup) based off our design jig, and proceed to assembly from there. We make sure the Y-pipe is cut evenly and prepped for welding to the single pipe that runs to the OEM midsection, and once thatís done weíll tack the tailpipes in place (once again, according to the designís jig, which lays out exactly how to build the exhaust such that the tips and all other parts will match up correctly to their corresponding spots on the E39 M5ís body).









      And if youíre wondering what a jig looks likeÖ Well, we canít show you the whole thing, but below is a picture from the jigís assembly process. As we mentioned, itís a strict set of guidelines on where and how to arrange all the pieces of the finished product for perfect fitment.





      Once everything is lined up in the jig, itís time to start the final welds for the main parts of the exhaust (namely, the resonators, tailpipes, and connection at the axle):





      After that, itís back to the jig to finalize mount placement.







      After everything is welded in place, we test-fit the exhaust system with the supplied clamps, in order to ensure a tight fit at all points, free of exhaust leaks or other pesky issues. We decided to use these specific clamps due to their smaller profile and their simplicity; rather than having to cut the OEM exhaust and weld on new flanges or v-band connections, this system lets you cut and then immediately clamp, saving you time and money during installation.





      Once every part of the system is welded into place, weíll test-fit it once more, just to ensure nothing has warped or moved around during the fabrication process. If everything looks good, itíll end up in a box and on a truck to the exhaust systemís new owner!





      This article was originally published in forum thread: New E39 M5 S62 V8 rear section exhaust option from Fluid Motor Works - Work of art started by Sticky View original post
      Comments 11 Comments
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        BEautiful Work by FMW! VEry Nice!
      1. Sorena's Avatar
        Sorena -
        Very nice. Click here to enlarge
      1. JAWS Motorsport's Avatar
        JAWS Motorsport -
        Nice work!
      1. Mike@VAC's Avatar
        Mike@VAC -
        DROOOOL
      1. Malaka1's Avatar
        Malaka1 -
        Man I love the E39 M5! It makes me want one now.
      1. fundahl's Avatar
        fundahl -
        Thanks for the great product and documentation!
      1. evolve's Avatar
        evolve -
        Very very nice TIG welding.

        Only a hand full of exhausts have the 2 in 2 out design and indeed it gives that very heavy deep noise.

        Excellent stuff.
      1. FluidMotorUnion's Avatar
        FluidMotorUnion -
        Hey, thanks for the comments, everybody Click here to enlarge

        Can't believe this didn't pop up on Google Alerts. Oh well, time to fire the social media guy.

        Since we're obviously not a vendor on here (yet -- we're currently rearranging all that business behind the scenes, along with a few other parts of our online presence), we won't get into a whole bunch of details, nor will we mention the board on which there's currently all the details on pricing, but it's all out there in the Wild West known as the World Wide Web.

        Again, thanks guys, and thanks to Sticky for putting this up!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by FluidMotorUnion Click here to enlarge
        Hey, thanks for the comments, everybody Click here to enlarge

        Can't believe this didn't pop up on Google Alerts. Oh well, time to fire the social media guy.

        Since we're obviously not a vendor on here (yet -- we're currently rearranging all that business behind the scenes, along with a few other parts of our online presence), we won't get into a whole bunch of details, nor will we mention the board on which there's currently all the details on pricing, but it's all out there in the Wild West known as the World Wide Web.

        Again, thanks guys, and thanks to Sticky for putting this up!
        We appreciate quality work whether it be from our vendors or not.

        There is a bunch of your stuff I want to put up but in order to be fair to our vendors I can't yet. This was too good though Click here to enlarge
      1. GG///M3's Avatar
        GG///M3 -
        awesome welds. now if someone can make a darn twin screw sc kit for the e39 m5. Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
        awesome welds. now if someone can make a darn twin screw sc kit for the e39 m5. Click here to enlarge
        Prob best to just stick with the M62.