Actually there might be some changes. I havent dynoed an older P9R. I know the EVO 2 off road P7Rs had changes in timing from the new head to the old head. And also changes from the original P7R to the EVO 2. This P9R I tested is the latest P9R out.
Adam Blevins Owner/Operator of AB Mods X-Dyno equipped and World Record holding engines!