[400TT]

More power helps, but it's not everything, not even close.

If you look closely at the Nationals results you will see plenty of fairly low power cars running near the top of the overall results for each event. Some events in last few years have been won by such cars. A lot of it comes down to driver skill, vehicle refinement, practice, how committed you are(brave) etc.

My brother even won King Cobra a few years back with a stock 4lt Lexus engine putting out 220rwhp. Believe it or not...

Tyres make the biggest difference, why not just classify it this way:

Class 1: Standard Street Rubber
Class 2: Race Compound Street Rubber
(unregistered & cars on slicks not allowed in the above classes so maye a 3rd class for them)

Simple, yet effective.