Assured by member here that 2003-4 muffler tips fit ok on earlier cars, so did this. Clearly the newer bumper design works a little better, but this is ok.
I'm VERY pleased at the sound change from this. It's subtle and I'd describe as similar to the "hollow" sound we hear from Mustangs and, yes, newer Porsche. Mostly noticeable accelerating, especially from lower rpm.
Pleasantly surprised, as I just did it for the look.