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CS stands for club sport, but DMV and carfax et al don't differentiate models, they list all possible for that year, so you see stuff like S4/GT on automatics none of which are GT's.
I can't imagine what a tune up would be on any newer 928, none of the typical inexpensive parts like plugs are remotely typical as problem solvers. OTOH runs rough needs potentially thousands of dollars in new parts and troubleshooting to fix doesn't sell cars.
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