You won't be dissapointed with that alternator.
We bought a 270A from DC-Power (I'd say they're both on par with each other) and after the abuse it went through I will run nothing else. We bought it in 2016 for our shop 6.0L Powerstroke and in that time it has accrued 70k miles, plowed snow commercially for every one of those years (4-12hrs, sometimes more) at a time, was used for various high current jumpstarts on large equipment/vehicles etc and it
FINALLY had an issue.
It appears the voltage reg has failed. With that, I sent it back in to DC-Power and they're going to go through it, repair it, and recase it for my Duramax application (with black front/rear billet housings) for $240 which is killer. Below is the alt in question.
Our XP series high-output alternators are the ultimate upgrade when you need the absolute biggest and most sophisticated high output alternator on the planet. All of our XP series alternators are designed for one purpose, brute force idle output. When you need the most extreme idle output with...
www.dcpowerinc.com
Reed makes some killer turbos! What size did you end up going with again?