ummm, that number for the stock alternator is WAY HIGH. If you have the 6i (4cyl) it is a 90Amp alternator. If you have a 6s(6cyl) you have a 110 Amp alternator.
My 6s never had dimming problems with 4k watts. I also had a huge battery in the trunk and 6 runs of 1/0 from the alternator to the...