My friends hahn soltice engine died recently, we think its because the tune was not good (We live in California and require different tune for our cheap gas), he was told that he would receive a tune made for California. He now has a new engine and upgraded the kit to stage III and his engine is knocking, he was told he would get a California tune also on stage III but I think hes going to have to go to a local tuner to get the job done properly. I am having my sky fitted with a Hahn kit as I type this, my only concern is their California tune. I think you guys in other states should be good, the hardware itself is first class, its the "california software" that concerns me.