They both use vacum Stu....injection is too expensive...injection costs about $30.000 for a guard mould...thats ONE guard shape, to do a bike say front guard, rear guard, 2 side panels-L/H R/H, front number plate theres probably $100,000 in tooling and then theres the tank, which are "spun" in a machine to give that factory finish....thats why you get what you get.