I had Dynamic build a 9 1/2 converter for my 408 and it was just way too loose. Thing flashed to 4200 rpm. It was real smooth around town but seemed too loose on the highway. I converted both my cars to Martin Saine custom converters. Very very impressed ...just feels like I'm always in the sweet spot. By the way his converters look like artwork and they are way more stout then the Dynamic. Sorry no pics.