You will generally only find modded cars at Losail...of which there are some seriously heavy duty mods, including a beautiful M3 and 911 GT3 that make regualar outings.
The problem will be getting parts, and finding one of the few mechanics who's got the experience and knowledge to do the job right.

QaQc...are you saying adding better brakes to my car would mean it fails inspection? or is it a question of who you know?