And mine has 51k. That really doesnt matter. Each car requires a different amount of power, and each car will have a different stock battery.Well my car has 45k miles on it and it's pretty much been parked since April of 2010, so it's still in pretty good shape under the hood. I would assume the alternator would still be in good shape too. And I bought the MB Quart ONX1.1500D, so I wouldn't call it expensive lol.
I'll do the big 3 for now.
What do your volts sit at idle, then with max AC and brights on? When you get the stuff installed, keep checking the volts as you up the gains and see what happens.