M4 Rear Side Bumper Extension?

HotRodM4 · 01-13-2021, 06:57 AM

I'm thinking about getting cf side bumper extensions for my M4. I already have the M Performance diffuser.

I found this one from AA Concepts Co.

https://aaconceptsco.com/products/f8...per-extensions

Couple questions:
• Do extensions actually help with rocks kicking up?
• Or is it just a cosmetic thing?
• Is there another brand you guys recommend that fits with the MP diffuser?

bsmf8x · 01-13-2021, 09:10 AM

I'd just get a v style replica these look like wannabes of those. M performance diffuser was made to not have side pieces In My opinion

VroomBahpop · 01-13-2021, 03:02 PM

It does help somewhat since it does protrude out the slightest, though yes more aesthetics than function. I plan to add the carbon rear flaps when they become available. What I liked most is they cover the exhaust cans at side profile.

01-13-2021, 06:57 AM	#1
HotRodM4 Lieutenant 686 Rep 583 Posts Drives: 2018 M4 Join Date: Oct 2018 Location: NY iTrader: (0) Garage List [10.00]	I'm thinking about getting cf side bumper extensions for my M4. I already have the M Performance diffuser. I found this one from AA Concepts Co. https://aaconceptsco.com/products/f8...per-extensions Couple questions: • Do extensions actually help with rocks kicking up? • Or is it just a cosmetic thing? • Is there another brand you guys recommend that fits with the MP diffuser? Attached Images __________________ ?18 M4 Comp
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01-13-2021, 09:10 AM	#2
bsmf8x Lieutenant Colonel 777 Rep 1,636 Posts Drives: F82 Join Date: Jan 2020 Location: NY iTrader: (1)	I'd just get a v style replica these look like wannabes of those. M performance diffuser was made to not have side pieces In My opinion
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01-13-2021, 03:02 PM	#3
VroomBahpop Private 28 Rep 90 Posts Drives: 2016 BMW M4 F82 Join Date: Aug 2020 Location: California iTrader: (0)	It does help somewhat since it does protrude out the slightest, though yes more aesthetics than function. I plan to add the carbon rear flaps when they become available. What I liked most is they cover the exhaust cans at side profile. __________________ A floored M DCT shifting is one of the most Beautiful sounds I have ever heard.... Previous: 1999 Prelude SH, 2002 C5 Corvette, 2017 Civic Si, 2010 Tundra, too many motorcycles to list and too dangerous, The M4 is my bike riding on fours
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