Vehicle prep: concurring with the above. If you are taking advantage of the ITB-into-FP allowance, your car must 100% conform to the ITB regs (including DOT tires).
However, if you wish to begin doing some mods toward FP, once you do a mod that is not compliant to ITB then the car must fully conform to FP regs, including the safety requirements for rollcage, fuel cell (if required), fire system, etc.
No mixy-matchy/picky-choosey of regs allowed. And any FP mods would, of course, make you non-compliant to ITB regs...
Runoffs qually procedure is described in GCR 3.7.4 and the link below. You must enter and compete in these events as an F Prod car. Any other ITB results will not count toward Runoffs qualification requirements.
HOWEVER, at the 2026 Runoffs Road Racing Town Hall, Eric Prill floated the idea that we may change our qually procedures to allow "any four races" to count; so for example, four Regional race finishes. I have not heard anything further on that, other than it's still being considered. I suggest that if that's going to change then we'll probably have answer in the next Fastrack (CalClub is holding a Majors this weekend that will count toward 2027 qually).
Regardless, you would still need to enter and compete in F Prod for those races to count.
Finally...how speedy is the car in ITB prep? Can you run within 115% of the expected polesitter time at the Runoffs? Reason I ask, that will be a requirement to start the Runoffs race, miss that hurdle and you will be parked. For reference, at the ARRC former national chapmion Mark Carpenter's best FP time in Race 1 was 1:43.759; 115% would be 1:59.323. ITB winner Ke Shao's best time was 1:52.432.
All makes sense? - GA