Be very careful when applying it. I bought one for my car from a place down the street that makes custom ones. Luckily, it only cost $25. When I went to put it on, I didn't take the curve of the spoiler into consideration. The decal / sticker ended up in the garbage. Might tackle this one again this summer, but I will leave the application to a buddy of mine who does such things.
Any Lettering shop should be able to make one for you for $25 or less. Had mine made for $15. Yes I forgot about the slight curve for the S. Don't you.
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2000 Boxster S
And then there are the Motorcycles.