520 chain conv really makes a difference though...especailly on an older zx6. Horsepower loss due to a loose,or worn chain is suprising. The 520 chain is much lighter. But, if you wanna go fast in a straight line, strap it, slam it, and spray it. If you wanna be cool and say you went one down in the front to your buds, but you never "ride" your bike, then just lie to your friends. It makes more sense.