So why did I get a new ecu? I always felt like my MPG went way down since I got the MTM tune ecu switching from my organically APR tuned ecu. Not to mention I liked how with the APR I could switch to "stock" mode if I know someone else would be driving my car or I want the best MPGs possible. All in all, this is just an expensive test to see if I'm right about better MPGs. The up side with the APR tune is that my Check Engine light now works again. I believe whoever did the MTM tune coded out the CEL. Also, this Stage 2 APR tune codes out the rear O2's so I won't be seeing those errors anymore.