The alternator I had gotten from Nathan is great. Direct bolt on and solid construction. Runs like a champ. Tested with an extra battery, and 2 avionixx axt 800.2's (1600 watts at 8 ohms at 12.5v). Upon strapping the two amps at 4 ohms and playing many tones I was satisfied with the performance of this alternator. Voltage drop was minimal considering the amount of power that my avionixx's were sucking. All in all this thing is sweetness. 10/10 because it came with a sweet pen.