We installed long tube Hedmans and a Hughes 2500 convertor in the ol' 93L. W e can't really tell a lot yet, we haven't driven it much. I think it does feel like it has more "off the line" punch. I figure that is convertor. It may be the power of suggestion but I think the engine winds a little better. The dumps make for a "young" sound, I told my son I was too old for that if I was going to be driving it all the time!