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I've had the Ground Control Street plates for about 3-4 years now, first with the OE shocks, and now with Koni Yellows. They are totally silent, and I've been very pleased with them. Sorry I can't help, but at least it's good to know that you should be able to fix the issue. I'm using BMW performance springs, so the OE style, so I have an OE style top hat. Not sure that should matter though. I may switch to smaller diameter race springs later this year.
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2009 135i, Alpine White, 6MT, M-Sport, iDrive, iPod/USB, Heated Seats, Premium Sound, BMW Assist
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