You can already list all of your modifications and the times you run in the TRGarage. Surprisingly few people do this; I really like the feature and I keep mine up to date. Also, a template like yours works better on car-specific boards- what does a rotary owner put in the fields for "crank", "rods", "cams"? Where do I put my turbo information?

I'd suggest just getting people to fill out their TRGarages fully, and then people can look at the garages of people who run good times and see what they've got done.