The engine is still pulling well over 6000. I have manually shifted it at 6500 where it seems to top out. Since I run a lower than stock convertor I have a nice power band from 3000 up and with the nitrous on it lowers that to 2500 or so. I just hate to spin that stock 2.5 over 6000 15 or 20 times a day as I usually thrash it that much on the way to and from work lol. It probably would not hurt it but I'm trying to cut down on the major repairs for a while and just drive the car.