Quote Originally Posted by StraightSix
In TT everyone is gridded based on times to allow every competitor the best chance of clean track. DE4 on the other hand is the group reserved for instructors.

It would probably be best Tripper, if you e-mailed Ken Brewer or Jeff Engalnd about classing stuff. Ken's probably the better of the two for classing questions. If you have something really oddball they'll refer you to Greg Greenabaum. The contact info for Ken is on the SE contact us page.
If he has aftermarket forced induction he is going to be in the top 3 classes, just quick basic math puts him at 8 to 1 power to weight with no adjustments, I'm reasonably sure he will end up in tts. But you need to fill out the form and make sure.

Matt