Matt-

The VW guys have been running posts about this consistently... of course, theirs is a unique situation.

The Comp. Board will not allow you to "switch" a car's spec. The VIN number will usually tell you which model and trim level the car was from the factory, as well as some option codes.

VW GTI's seem to be a special case. In some cases there were no VIN codes to differentiate the GTI's from regular Golfs, or even 8v vs. 16v cars (ITB vs ITA, I think). In these cases it's not uncommon for people to "manufacture" a GTI racer from a Golf shell (See recent GrassRoots Motorsports for a perfect example).

I'm not implicitly familiar with the Honda codes, but I believe the EX and DX are not interchangeable.

-Tom