John is top notch, I’ve known John since 2003. He’s invited me into his home for supper, invited me to room together with him and his late father during swap meets,and gave me my first tour of downtown Chicago. As a businessman he has been a true innovator for the torqueflight community. If you haven’t seen his new valve bodies that incorporate the Tesla valve, you NEED to check that out. I’m almost positive most of John’s converters are from PTC. And have been since I’ve known him.