Its on page 9 of 63
http://986forum.com/forums/uploads02/9861554301269.jpg

Looks like these are starting to be available again for around $236, after a period of being out of stock everywhere (except for the $$$ Porsche branded part).

Umm...no.

SPB Class Rules and SPB Eligible Models
Eligible models for SPB are 1997-1999 Porsche Boxster 2.5L, motor #M96.20. All parts must be factory stock from one of the eligible years, except where modifications are specifically allowed below. Modifications not specifically listed are prohibited.

It's crystal clear on page 8/9 of the current rule book that this is allowed. And if the fastest car/driver in the country came here to say that he likes it, we should all be doing it

This rule is on page 8 of 63 "CAR REQUIREMENTS APPLICABLE TO ALL CARS IN ALL CLASSES", I race my spec boxster in both the POC and PCA. I confirmed this with the PCA national Steward before installing. Huge difference