if you have the bucks have your car dyno,ed and the memcal done at the same place so,s they can fine tune the memcal, mind you that can run into the thousands to get it done right! But if you have your memcal installed already then it wont realy make a diff , it will only give you a read out of what the memcal (power gain if any) has done for the car... the best way is get it dynoed b4 the chip so you can c what you have to work with....