May have screwed up my car?

[Boxtaboy]

Nope...not the serpentine belt. You have fried your clutch. That is the clutch slipping. New clutch time. Sorry.

And the slipping will only get worse until it totally dies on you, and you won't be able to move the car. The slipping will basically get to the point where you shift into the gear, step on the gas, and you will see the revs go up, but the car won't move anymore. Get it to a shop and have the clutch replaced, and don't use the Boxster as a drag racer anymore...it's not meant for that kinda work.