Did you make a post here: http://www.caraudioclassifieds.org/forum/forumdisplay.php?f=37 This is there official forum and responds back very quickly. Mechman alts are the only ones I've heard and seen results of theirs holding a better idle output than most others.
MECHMAN quoted me$499 for a full large case conversion kit. 250 amps with over 150 at idle im kinda low on cash right now so i don't know it i could get it for a few weeks
do you think its worth it or should i just get the Excessive Amperage