Pump Up The Noise

09 Jun Pump Up The Noise

Posted at 12:36h in Blog, BMW, FMU Customer Projects, Gary's E39 M5 by
1 Like

Gary’s exhaust? Oh yeah, it’s done.

Featuring T304 stainless throughout, with all the welds and everything made by hand, this exhaust is one or two steps removed from Gold Wheels’ bespoke exhaust. Obviously, there are no side cutouts, and a few extra resonators, but the sound is getting close. After his later-planned cams and headers, it’ll be pretty darn close. Maybe we’ll name it Grey Wheels. By the way, everything in that exhaust is ours; we drilled the holes for the bungs, put together the x-pipe, polished and fitted the tips, everything.

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And Gary’s CNS clutch and flywheel were installed yesterday, along with a diff pinion seal. Now that the drivetrain is all taken care of, it’s time to put this baby on the dyno for a custom ECU tune. Keep your fingers crossed for some quality video!

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6 Comments
  • watcher
    Posted at 13:29h, 09 June

    that mcgrath plate frame has got to go!

  • fluidmotorunion
    Posted at 15:03h, 09 June

    agreed!

  • alex
    Posted at 15:24h, 09 June

    beautiful welds as always! i’m curious though as to why you guys decided to make 2 “X” sections? from most of the E39 M5 exhausts i’ve seen, they typically only had 1 “X” section.

    i’m looking forward to seeing the dyno results!

  • fluidmotorunion
    Posted at 16:39h, 09 June

    The customer requested two x-pipes, and so we delivered. Plus, it’s more reason to take close-up pictures.

  • alex
    Posted at 16:13h, 10 June

    Haha, for sure an exhaust fabricated and welded that well deserves to not only be on a monster M5, but also on a museum wall.

    Great work!

  • Gary
    Posted at 16:26h, 06 August

    I’m the owner and I love what FMU has done. The exhaust and Alpha-N tune yielded a 35 whp gain plus a huge improvement in drivability. The first x-pipe is for performance and the second x-pipe is for sound. The resonators are all straight through but the sound is relatively sedate until it goes above 4,000 rpm. This set up is currently mated to the stock headers but FMU did a great job that when I switch to SS racing headers there is plenty of room for them to mate up before the first x-pipe. Actually, the stock exhaust is pretty impressive looking too with the four huge mufflers and it is going on the wall of my den.

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