Steve,
I'm looking into doing this as well.
Are you going with the newer spring loaded tensioner?
Apparently these can be used on the older 5 chain cars.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation