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      02-15-2017, 04:20 PM   #1
dre99gsx
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Options: Z4 nonM rear bumper modifications

Looking to add some more aggressiveness to the nonM z4 rear bumper (revised bumper). Any options out there? Found some diffusers which sit underneath, but not my style.

Was looking for something like this:



But no longer made...

Or this:



But obviously for the E85/E86 version - nothing exists.

Not looking to replace the bumper either. Thoughts?
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      02-25-2017, 06:04 PM   #2
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Screw it... found a way to adapt the E89 Z4 carbon fiber diffuser onto my 3.0si



Took a bit of elbow grease, but it fits
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      02-25-2017, 06:08 PM   #3
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Very nice!

Do you have pictures of your dual exhaust setup? There arent any in your build topic.
Curious if you went Y pipe from the mid of the car (so true dual muffler) or a breakout pipe to the right from the rear muffler.
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Last edited by GuidoK; 02-25-2017 at 06:17 PM..
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      02-25-2017, 06:39 PM   #4
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Quote:
Originally Posted by GuidoK View Post


Very nice!

Do you have pictures of your dual exhaust setup? There arent any in your build topic.
Curious if you went Y pipe from the mid of the car (so true dual muffler) or a breakout pipe to the right from the rear muffler.
I second this question. Guess this would fit on a 03 roadster too? Turned out great my friend.
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      02-25-2017, 07:13 PM   #5
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Thanks. The diffuser follows the rear bumper curvature, but mounting it required some trick brackets hidden inside. I cut the bumper in minimal locations as well, didn't need much trimming.

As for the exhaust, I run a single muffler to the driver-side dual tips, and the external wastegate via a long tube to the driver side pipes.

No pics on the build thread since this was an afterthought I'll have better pics sometime next week.
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      02-25-2017, 07:45 PM   #6
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Wastegate as seperate exhaust tip. Thats pretty original I must say.
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      02-26-2017, 07:03 AM   #7
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That looks GREAT!!! Excellent job
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      02-26-2017, 02:46 PM   #8
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      02-26-2017, 03:23 PM   #9
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This is great news, looks good too gj

Did you have to move the exhausts to fit the diffuser or did they happen to line up?
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      02-26-2017, 03:28 PM   #10
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Thanks! Had to shift the driver side muffler over about 2 inches further to the edge. This is because the stock E89 Z4 exhaust holes are further spaced apart.
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      02-26-2017, 03:36 PM   #11
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      03-02-2017, 03:28 AM   #12
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in the german zroadster forum there is a guy you has made a near-oem replica of the E86 Facelift aero carbon diffusor.
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      03-03-2017, 04:09 AM   #13
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Pics?
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      05-30-2017, 07:35 PM   #14
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There is always the Rieger diffuser for anyone else looking

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