[@Delta44]
Anything that is not your special ability or has no good explanation on why it is so special counts towards the stats of your vehicle.

Eg: your speakers that gige you good downforce are the reason for your grip and the special chassis is why u have 25 frame. Rocket boosters are what give you 30, BUT they can possibly give you a mid air bonus as they could possibly do it (cause science)

Its how my military grade armor is the reason for my very high frame and slow speed, but can also explain very good insulation of such a specifuc event arises.