I ran one on my old XJ ('98) and they did a "diesel" spin (?) Not sure how thats different but it was 160 amps at idle and 210 peak. I was running a 2800 watt system along with some PIAAs, and a few other goodies that like to draw power. After installing the Mean Green I didn't have any trouble with them except when cranking the system in competitions (peaked at 157.3 db)...but thats almost 3000 watts being drawn.
I ran the Mean Green for about 4-5 years without any issues and would not hesitate to run them again in the future. As far as what amperage to to get...well, give them a call and ask. Thats what I did and they did one "to order" for me.
Hope it helps