Is it possible to get a larger amped alternator for my 2.5 w/o going custom?? I've got all the bells and wistles that was offered for my car minus the sunroof (5mt well worth the loss) and I'm going to put in a 1300w stereo setup but don't want to kill anything (yes I'll be running a cap.) and don't want dual batteries. I just want an upgraded (more powerful) alternator. Is their one out their???