I Posted this a while back:
Anyone have a map for this 2014 YZ450 with Yoshimura RS4 Full System? With the stock system I used an Action Motocross Mag map (all + 2, +3, or +4). For the Yoshi I set it all back to 0's because I heard thats how Yoshimura tests them. I called Yoshimura and they said they have to comply with EPA standards, so I thought it could be pumped up. I was wondering if someone out there has tried something different.