One thing you all have to remember is you won't go 2mph faster if your stock fuel system is adequate and supplies the needed fuel,STEVE forgot to mention this.He says he picked up 6mph from a big motor???Well that only means his fuel system couldn't supply the needed fuel for that big motor and it was running lean,simple.The fuel system will not give you 1 hp if you don,t need any more fuel.If you change fuel system you will have to remap it.NICK SMITH is the very first guy that i know that has done this and he is the one who gave me the idea and info to get me started,my set up is a little different but it all started with his info's.