Lenny at Ultimate Converter. He's a member here and his product/customer support is GREAT! I run one of his older ones in my Mirada, we ran a 9" Coan that was updated by him in my dads car...but this coming year we're going to try one of his 8" converters. Friend of mine runs one in his 8 sec Challenger and he's sold a few Ultimates to his customers.