Exhaust System: Frame sliders and windscreens are functional items for the daily commute, but they aren't the most exciting mods in the world. A high-quality EPA/ECE-compliant exhaust system, on the other hand, is a bit dreamier and a good entry point to performance modifications. Besides, if commuting on a motorcycle was solely about convenience and functionality, it would be easier to just take a car, right? Akropovic exhaust systems are worth a look, though as you'd expect they tend to be on the pricey side. Yamaha Factory Accessories includes a Yoshimura system ($990) that's another great option.