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Search allmotor2000's posts, he added a couple Helmholtz resonators and even created a table used to determine at which RPM you get drone that'll help determine the size and length of the resonator. Another member on the X5M boards, protecon, took that same table and made it into a live Excel spreadsheet but I'm waiting for him to email it to me.
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's
'97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's
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