Right now I have the 2.85 pulley with a stock lower. We are going to a 2.75 upper. I run at elevation. 3000-7000 feet. So I am not in dire straits of blowing up the engine. If I plan to run 93 plus octane and once in a while E50, not E85, what injector size should I get? Also is it mandatory to get the iD1050X or are less expensive Bosch or other brands ok?