Just do it. You could be waiting a long time. If I had to choose, I'd stay with the thump to keep the drop. You can always revert back to stock should there be a opportunity to fix the thump sooner.
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Current non-BMW's
20 Jeep Grand Cherokee
03 Cooper S (Maxi Tuned 50bhp)
60 Impala (43k orig mi)
15 Turbo S (Kobb tune and Kline exhaust)
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