I have been reading about Edge and Superchip performance and it seems that all the examples are for automatic trans. ( shift point etc. ) How are they on 6 speeds? With prices going up improved fuel mileage is just as important as overall performance. Any suggestions
2002 3500 Sport 4x4 6 speed 3:55 rear
2002 3500 Sport 4x4 6 speed 3:55 rear