I had an Accessport for my '03 wagon. It is pretty much just plug and play. In it's basic form, it is great for someone like me who just wants the extra performance it provides without doing the whole tuning thing. There is/was a tuner version available. For me it was just safer and easier to use the tunes that Cobb supplied. Of course, I wasn't looking for a race car, just a car that was well tuned for the street. I will probably buy one for my car in the future. I am trying to unload my current one now, I wish Cobb had a trade in deal.