I'd guess it depends how severe the slope is.
My garage floor has a 1/4" per foot slope, and I've noticed no ill effects with my Boxster and the 5.0 Mustang I had previously.
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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
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