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      01-26-2013, 02:46 AM   #1
Private First Class
Drives: 2011 135i
Join Date: Sep 2012
Location: Philippines

Posts: 146
iTrader: (0)

High Frequency sound inside cabin after Berk Exhaust Install

Hi guys

Finally installed the Berk Exhaust street performance exhaust package:

This is on a 135i N55 engine.

I noticed that there is an annoying hi frequency sound inside the cabin at certain rpms. It hurts the ears.

The sound is similar to when you puncture a tire and air is coming out. whhhhhhsh sound but it quite irritating.

Lowering the windows a little helps.

Other mods include the BMS air intake.

Please help.

capri is offline   Philippines
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