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About the top speed thing, I thought they could only go a certain top speed; like I think the 450 is in the LOW 70's....That is just what I read, no bs, I love my 450 but I don't think it will do 78 mph!
Looked to me like a short drag where the 4x4 took off while the others spun. Put them all on pavement and try it again. Notice how bad they were gaining at the end? Of course the BF gives a sport quad a better run than any other 600lb quad.