I have the powerpup tuner, which i guess they don't sell anymore, but it did what I wanted. I can set the rev limit higher (7100 for auto) and the idle higher for better line starts, the timing can be increased by either 1 or 2 degrees, and the speed limiter can be set to 180mph. The website offers free updates and support for any questions you may have. I am dealing with them now about the wide open throttle option on the tuner but not working for my tune yet. The tuner has a stock setting, an 87 octane setting and a premium setting for preloaded tunes in addition to what I mentioned earlier. As any "real" tuner will tell you, to get the best tune, every car should be tuned individualy for the car and driver by a specialty shop or specialty race tuner. The bullydog, as well as any other pre-tuned download offered, gives us a general tune to increase the output of our cars, which IMHO is all we really need. I like the bullydog but I haven't used any other system so I can't say if it's better than another tuner but I do like the results. As for the dyno....thats either used to test or have bragging rights for your cars numbers, you would be wasting your money to get one unless you need to know exactly what your car is doing that day. Again just my opinion. Hope this helps. Sorry, but it takes me awhile to get back on the forum sometimes, I drive a semi and that usually takes up most of my time. I would be happy to answer any other questions about it or give you my opinion on any other questions you may have. The more brains, answers and opinions.....the better the results.

OH YEA....if you DO buy one, it gets locked to your cars vin so you can't sell it if your not happy with the results.