blow it dude dude stick to 10:1. you can still blow the hell out of it. propper cam to bleed low rpm's cylinder pressure, VERY good intercooling (air-water), and engine managment to handle all situations.don't piss away output because of misnomers about C/R. sure pre-ignition happens, but there are factors you can control. reflective coatings, smoothed chamber surfaces, cool plugs, a slightly rich mixture to quench hot spots, etc. intercooling overkill. that's the ticket.