Trunk air pressure release flaps

kaigoss69 · 08-20-2014, 04:53 PM

These can be found on the left and right rear trunk wall panels, right next to the OEM amp and the battery. There are rubber flappers that can open up to the outside so that when you close the trunk the pressure wave can escape. Does anybody know if the cavity behind these flaps is a wet cavity? Reason I ask is that with my IB setup they make a lot of noise and I have stuffed some foam in there to hold the flaps open. This eliminates the noise but I am not sure if I there can be water coming in now in case this is a wet cavity. Thx

e90TiAg335i · 08-21-2014, 12:15 AM

I don't think it is considering its behind the bumper cover mounting brackets and pretty well protected by the wheel well. Maybe we should pull the bumper off. Remove the flaps and use the membrane material. Not sure it would flow enough air though.

kaigoss69 · 08-21-2014, 08:35 AM

Quote:

Originally Posted by e90TiAg335i

I don't think it is considering its behind the bumper cover mounting brackets and pretty well protected by the wheel well. Maybe we should pull the bumper off. Remove the flaps and use the membrane material. Not sure it would flow enough air though.

Yeah that is a possibility, but it may be overkill. Thanks for the info, I think I'll just leave it like this and keep an eye on it.

08-20-2014, 04:53 PM	#1
kaigoss69 Brigadier General 301 Rep 3,969 Posts Drives: '08 335i Join Date: Jul 2008 Location: JAX iTrader: (6)	Trunk air pressure release flaps These can be found on the left and right rear trunk wall panels, right next to the OEM amp and the battery. There are rubber flappers that can open up to the outside so that when you close the trunk the pressure wave can escape. Does anybody know if the cavity behind these flaps is a wet cavity? Reason I ask is that with my IB setup they make a lot of noise and I have stuffed some foam in there to hold the flaps open. This eliminates the noise but I am not sure if I there can be water coming in now in case this is a wet cavity. Thx __________________ Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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08-21-2014, 12:15 AM	#2
e90TiAg335i Major 128 Rep 1,151 Posts Drives: 10 e90 335i Join Date: Mar 2010 Location: jacksonville, FL iTrader: (10) Garage List 2010 e90 335i [7.00]	I don't think it is considering its behind the bumper cover mounting brackets and pretty well protected by the wheel well. Maybe we should pull the bumper off. Remove the flaps and use the membrane material. Not sure it would flow enough air though. __________________ JB4, DP, VMR V710, Sonic Tuning S1 coilovers, Hybrid Ovations, Soundsplinter 10" and Zapco DC Ref amps
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