It's been a while since I installed mine and can't quite remember which one. I posted a thread here, but I think it got lost in the big delete. The one I got was a 130 amp, if I recall and was a direct bolt in. I did upgrade the charge wire to 6 gauge. I'll look at it tomorrow and see if I can figure out which one I have. A couple days ago I went to a cars and coffee event and one of the guys had a 80's Ford Mustang State Trooper car and had the lights running for a while. His battery died and another guy in a Toyota pickup tried to give him a jump. They tried for a little while and weren't having much luck. I volunteered since I have the high amp alternator and after we hooked up to my car, his car started as soon as he turned the key.