Please don't say things when you have no idea what you are talking about.
We have a 5,000 square foot wharehouse, 1,000 square foot fabrication shop (tig, mig, benders, plasma table) a 2,000 square foot machine shop (two CNC 3 axis machines, CNC lathe, and two vertical mills) and a 500 square foot test labritory with over $200K worth of alternator dyno equipment. To say that we are not a "custom shop" simply because we didn't make a dual alternator bracket kit for your truck, is a very ignorant statement.
DC power will sell you a stock housing stator-swapped Denso unit, just like every other alternator company will. It will do OK at higher RPMS, but will have lousy output at idle, and probably NEVER make 250 amps at any RPM. Not to mention, that it will have much less cooling and half the rectifier.
I'm not saying anything bad about DC power, all I'm saying is that we take a very different approach. You can't make an 8" sub moove as much air as a 15" sub, and the same holds true for an alternator. If you want the ultimate in alternator beefyness, sometimes it takes a little "squeezing" to get it in there.