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      05-28-2026, 05:35 PM   #14
Sapper
Private First Class
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Drives: 135i 2013
Join Date: Jan 2018
Location: Canada, Saskatchewan

iTrader: (0)

If you guys have drone I reccomend a helmholtz resonator that any exhaust shop should have no trouble fabbing up, you will likely have drone at 100-120hz. They are like J pipes only much more forgiving on what size they have to be.

I had one done on mine for 1800-2500 rpm drone and worked like a charm. 12.5x4 inch chamber + 6-8 x 2 inch neck.
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