My buddy put an American Power Train TKO600 kit in his Fury and the kit less clutch arrived for a cost of just under $4,500. So whatever the going rate for the A855 is (which seems to be somewhat closely kept) would be the difference assuming you have existing factory 4 SPD components. APT can send a kit out the door tomorrow. So for an E or B body a kit is available if you are not set on a drop in solution.