With the cost of the alternator plus the upgrade I would say $2500. This includes the cost of swapping out the parts as well as installation. I did not do the install. The tuning cost me another $400. All told some 3K. Originally when I had it put in I was living in Houston and I was worried about the high temps and how a carb would handle it. The alternator they sent me originally was the wrong model as the gear was pushing up against the bottom of the block when installed. The EZ 2.0 never ran right on my motor. Just not enough parameters to deal with a modified motor. Fast charged me about $200 to switch to the Sportman XL. Once we could plug it into a tuners laptop we were off and running. What ever brand a person gets I would not get the base version as they are simply unable to deal with anything other than a stock motor. I would also get a good tuner to do some dyno work with it and have the tables setup for the kind of driving that you use the car for.

 

Was there an increase in power or gas mileage ?

 

I really cannot say as I have not run this particular motor with a different intake / fuel system. It starts well and idles nicely.. Given what has been done to the motor it will never be mistaken for a fuel miser. All I can say is that it is reliable and runs well.