Just picked up my YXZ last week. The very first thing I always do, living in lovely California, is get rid of the Catalytic plugs CARB makes manufactures put on all vehicles. Is chokes the bike and prevents good airflow. So I always focus first on letting air in, and letting air out.
The Graves system seems to be a solid option. Questions for the forum:
1 - Has anyone tried their system?
2 - I called Graves and they said I can use the stock EFU and just re-map it. They send the map and I just have to plug in and download it. No Power Commander or other unit necessary. Thoughts on this? Please tell me that I already had a bad experience in the selection evo x exhaust