with some mild porting, pipes, pods, and timing advance you will beat a 450 if you can get the power to the ground. Im not trying to act like im a drag racer, b/c im not but ive beat quite a few 450's a 700 raptor, and eat 660's all day long. If i could get my damn shee to shift right it would be nice. I think 450s are fast dont get me wrong but with some engine work there nothing assuming they only have light mods