Try contacting maniac electric motors and see what they can do for you, I just dealt with one of there alts for a subaru and it was rated 160 on the low end and at idle we couldn't pull it down below 14.2 and I know we where pulling well over 160amps we had every item including the stereo going full tilt. I will say don't order the big 3 kit from them it's just cheap stiff 0g and china made ebay terminals and take a wire brush to the pulley and get all the **** paint off it BEFORE you start it for the first time!