Bullydog has a "72 hr" (clock hours-not engine) trial version dealer can download. We tried it about 30 days ago. I think it was the "90 hp" mod? You could feel the h.p. if you wanted to use it. We were looking for better mpg. We saw nothing-no change. We let it expire.

I've read here in past where some said it was really necessary to change air inlet/cleaner system. So-I made sure to check the Tell-Tale air filter minder both before & after install. It never moved.