I've got this unit on my Duster. Haven't had a chance to use it much since I've only made 3 test passes since I installed it. I don't have the optional rpm software and I can already see that for a race car its a must. Otherwise you can't tell much about anything. It plays back in real time on the screen so its hard to get a good feel for the data. And with open headers it reads 0 at idle. It doesn't start to read anything until you get it under a load.