Rules change. Hard to keep up with the latest. The suposed progresion of a car is SS, then on to IT that allows more modifications to suspension, gutting, whatever will fit in the engine computer box. Last I heard in IT they can't police every program in every car, so as long as it fits inside the factory computer box, it's legal. Sucks to have mechanical fuel injection or carbs now. After IT the car gets moved on to the Production classes. Some Prod cars are limited prep and closer to IT cars than other full blown prod cars.
It would be hard to have the SCCA TDI cup car not allowed to run in SS. Ok, so it's not 100% a TDI cup car.
For Solo rule clarification, you can email Doug Gill or call him on the phone. What he says does carry some weight in the tech shed. Need to check the rule on fuel availability and how it gets sold/pumped to the consumer. I have my local prefered fuel mix I run in the FSP 78 Scirocco TD. Doug looked over all my documentation on my build and said " looks like you did your homework. Looks legal to me, but we'll be waiting for the protest." Hate to say personal stuff has kept me from running it and prepping it as much as I want. Not even sure I will make South Ga. in March
Clarify the rulling on the syndiesel legal for Solo and I will be ordering up some.