it wouldnt matter if the gkn axles were only good for 750 hp (t says used on 750 hp vipers on need-4-speeds website. that would place them right inbetween the level 2 for 1k and level 5 for 1.6K, in both hp rating and price. plus u save the pain of installing new hubs and putting the axles together, even tho putting axles together is a breeze.