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Sorry Steve, can't tell you any details. The humungeous size of my ignorance of these matters meant that I just went with Chris, the proprieter's recommendation. My Boxster is a tiptronic - a wise option for an old fart with dodgy hips, even though it promotes laziness and results in less precision.
I'll ask Chris about the replacement IMS and post his answer. The aftermarket audio amplifier spat the dummy and needed replacing this week; it never ends, does it?
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