Yeah, wiesco can be had in 11.5:1, but there was another company making 12 or 12.5:1's I'll have to search for that thread again on mx6.com. They may even have been for another make (Honda?) and modified for use in a KL motor, been awhile since I read it. But 11.5:1 would work too. I'm not trying to build the fastest MX6 ever, just one that'll make more power than a ZE is capable of.