Thats the way to go if you are looking for BIG power. At ultimate (local speed shop) I have seen a BUNCH of cars including 240's,STI's,EVO's ect ect tuned on AEM EMS and I gotta say the power/tq curve is always as smooth and the airfuel is always perfect. I gotta say its a GREAT tuning device but for the money that it cost to tune it unless you are looking for over 600whp or even maybe 700whp Id say its not worth it.