E39 M5 Axle Back Exhaust

05 Dec E39 M5 Axle Back Exhaust

Alright everybody, we’ve got an exciting new product that we want you all to see. Take a look at our new BMW E39 M5 axle back exhaust!

This E39 M5 axle-back system is made from medical grade 304 stainless steel and is fabricated by hand at Fluid MotorUnion in Naperville, 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 (that’s replaced by straight pipes), the resultant tone is raspy at best, and has a tendency to drone. The FMU’s 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 E39 M5 axle back has very little drone and is not overpowering during casual cruising.

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 doesn’t have to look totally different to sound better. The retail version will come fully polished, as well.

There’s 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 (if the embedded YouTube video gets in the way of the zoomed-in picture, just use the scrollbar to move it off the page – their formatting is a bit wacky):

We’ve also made a video featuring Mike’s 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:

This axle-back system can also be tastefully paired with our midsection which features an x-pipe, and can be used to delete the cats.

For more information about this exhaust system, and pricing, hit us up at [email protected]

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