What the heck? No springs in an 066 or 660's av, no flippy caps, and so far all the ones I've come across have unlimited coils. Also, I beg to differ on the "hand saw would be faster" bit. My stock 660 with a little exhaust work to fix a plating chip and a foam filter feels neck and neck with my ported 390, and at least as good as the 066 red light I've run. While the light exhaust work and filter might help it a bit, I doubt they do a whole lot to improve it's performance.Thay 066 is mint. Get it! No strato, limited coil, spring av, flippy caps, parts are plentiful. If the piston is good. With that said, double check it’s not like the de-tuned 660’s you have out there. A hand saw would be faster