Get a used Predator if cost is an issue. It will do everything a new one will and allows for custom tuning later if you decide to go that route. The capability for 3 tunes on an XCal 2 allows you, for instance, to have an 89 octane performance tune, a 93 octane performance tune, and, say, a nitrous or race tune in addition to your stock tune all in one place. Personally if I wanted to do that I would get a 4 position chip. Both tuners have a datalogging feature, with the XCal 2 capabilities looking a little better than the Predator to me in that respect. You can't go wrong with either one, and I would expect about a 15 HP gain with the 93 octane performance tune that comes with either tuner.