hi ben,
the cars today are really more direct ported than chipped (just a separate module installed on the ECU unit ) and are also be called remaped, the curve lines on the fuel and ignition will be higher, not to get into more details, than the stock so they will produce more hp, the mpg will be less if you step on the gas often but not so different if just cruising. Hope this gave you a little idea......for the phone kit, I just don't use it....
Jose
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