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Originally Posted by Insuranceman
Hi everyone! Just purchased a 2001 Boxster S 6 speed manual, with the factory hard top. It only had 17780 miles on it with the exception of a couple minor chips in the paint this car is mint. We discussed the IMS bearing and I asked if this car has the dual IMS or the single bearing? He said that he couldn't be sure just looking? So I have read on here that certain engine numbers have the dual and others have the single. Can anyone tell from the number the sticker under the front hood has m9621-671?
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I have the same model+year.There is no 100% reliable way to know which IMSB is installed without removing the gearbox. Mine was a single. It was working perfectly when removed at 90k miles. YEMV .
FWIW low miles garage queens are particularly vulnerable to the IMSB problem according to the experts. So you are wise to be considering the issue. Yours is a particularly valuable car so probably well worth The Solution.