My son and I both use the Dynamic 9.5 converter in our street cars and we could not be happier. They drive like normal cars as I can cruise at 1500 rpm or 2500 rpm and it has no slippage and drives great. At the track when I hammer it the converter flashes around 4200 and works nice. It may go a little faster with an 8" or better stall converter but this Dynamic works great as an all around converter for a street car thats sees the track once or twice a year. And mine has been in my car since 2006 and my sons has been in his Dart since 2003 and he just ran a new best last Oct. Ron