That's the major issue I have with a canned tune... you can swear you feel results but how can you be sure? I know you can say the same for every mod but at least you have a physical part installed on the car... with the electronic tune it is hard to judge without a dyno.
Just my 2 cents but I completely understand not having a local tuner (hell it took me 3 hrs to get to mine) and wanting some of the benefits.
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