My apologies, i was thinking STU and typed SPU.
Many of the local PCA folks in the DC area raced their cars in IT-E at Summit Point. Some with fair success. I don't think the Targa body qualifies anywhere in IT though. I raced a 911 Targa in the '80s but it was in D-Prod and then in GT-3. Dave Coleman and I dominated those classes and I thought that an IT-S 911 might stand a chance. I've learned an expensive lesson.
My IT-S Benz can produce the target process horsepower whereas the 911 was already stretched by the factory and doesn't come close.
Chuck