My experience with Mustangs is that the generic chips work best on the shift points on automatics than they raise HP. Yes they do richen up the mixture a tad but nothing too radical. And Yes 10 HP is hard to tell by seat of the pants dynoing. Custom chips can be very usefull after all other mods are put on the motor and the chip is done in conjunction with a dyno and very skilled technician. Add on chips are generally hit and miss and depend on how good the stock setup is!!
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