I have a 08 kingquad 750. Just put big gun exhaust, yellow secondary spring, 18 gram rollers, UNI air filter, dynatek fuel controller,new 27x10-12 vampires, and it's snorkeled. Still has some low end lag. All this helped but is there something else I could do? I heard about the vdi but the price is a lil high for me. Any help would be appreciated thanks