 Many enthusiasts modify their underbones either for show (such as installing small sound systems, neon lights and custom paint jobs) or for performance (like increasing the engine power and fine tuning the suspension).Riding gear may not even extend to wearing shoes and long pants for safety.Illegal underbone drag racing has become popular in countries such as the Philippines and Malaysia, and poses safety issues for the commuting public as well as the riders themselves, as underbones offer little protection in the event of crashes.