Looks like I'm going to go with an 840 kit within the next couple weeks. Need some info from you guys in the know. Does injector size have anything in common with jet size? We are at altitude out her and all of the machines have to be jetted down to run properly. With the injection it obviously takes care of itself. But when you go big bore ... would altitude keep you from having to increase injector size? I feel I might be looking at it all wrong. I just don't know if the high altitude would extend what duty cycle an injector can handle.