[kabel]

That crack will only get progressively worse. Patrick is correct, I know from experience. I recently hand stitched in a new piece of plastic and never plan to try that again!
I wanted a new gahh glass window top but experienced successive multiple what I call 'out of budget experiences' that put getting a new top way down on the priority list. So I opted to invest a little sweat equity and discovered it was a task that takes a lot of time, way more than I had anticipated. Took me a week of evenings to get it stitched in and the result is marginal at best, however I now have a rear window and that was really the point of that little adventure ($80 + 24 hours labor vs. $1800 for a new top).

My advise, if you can justify the cost, is a new top with glass window, which means no more need for the boxster 'chop'.