I just got off of the phone with John Cope and he was absolutely fun to talk with.
I had emailed him my car specs and he wanted me to call him about switching over from my current 10" converter to a 9" PTC unit. After our discussions, he told me that he did not feel that selling me one of the PTC 9.5" converters is the best for my car. Honesty, I like that!!!
He told me that going with a low gear set or a set of headers would be better money spent than another converter for my current combo and expectations.
If you are in the market for a converter, please place John towards the top of the list.