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Mail order tunes are only good for vehicles that no one likes to tune or to just make a small change quickly that is for something other than performance.
For anything performance or efficiency wise, you want a real in-person tune.
Also there is no "tuning out the cat", basically when you adjust the settings for the rear O2s, shutting then off and not having then throw codes etc, that is what makes the need for a cat no longer exist.
You can buy HP tuners to make the CEL adjustments, and to turn off the egr and A.I.R systems but then youd still want to go to a tuner to have everything else adjusted. Most tuners may even use your credits for HP(if they tune with HP) and cut you a slight discount cause it saves them a little money. Plus once you own HP, you can check trouble codes and make small changes down the line.
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