i have the V2 in my cr250, pretty good peice, still scares me theyre made out of plastic tho. also i have heard of a few people having sealing issues with them. Didnt have any issues with mine however
as a kid i had some boyesen reeds. made a huuge difference. dont know about the vforce but i heard they are great possibly better. you might look at throwing on a rad valve also. dont know if vforce makes something similiar