I am running the Luppo Dynamic 9.5 street/strip converter and I like it alot. Mine is a street car and this converter has been in my car since 2006. It will flash about 4200 at the track behind my 493 and will drive great on the street as it feels like a stock converter driving on the street. It has no slippage at all driving around on the street. I think I paid $575 in 2006 as I think they run $675 today or maybe a little more but it was a good buy for my money as it has given me 12 years of service so far and still working good. I usually talk with Sean when I called them to order my converter as of course they ask many questions as they should. I also have a 9.5 Dynamic converter in my sons 406 Dart and it works great for him also. Ron