Hi, I'm the John. I currently use the Busa springs from a Pro Race motor and Volvo valves. Metric installed both when they had my head from the DISA incident. The springs are the very best I've had and the valves are much thicker so they are better suited for high boost turbo applications. I have had no issues and I drive my car daily. I've run the behive springs with no issues too. The Busa springs were a "Hey we got these kick A$$ springs that will fit your head want to try them?" I've got about 15K miles on the turbo setup since last July. Marko and Danny are running the springs too with no issues.
I freely share information and help if your local. I don't drink and drive anymore I learned my lesson the hard way, lucky no one was killed.
John Smith |