i hear you can do it with out taking anything off so i first tried it that way. spent some time pulling the old one off and trying to install the new one. but there was no way the bov hose fitting was going to fit through with my fuel lines and all that good stuff. so i ended up pulling the i/c and unbolting the i/m to give me some room. its just everything wanted to be a pita! one after another just did not want to line up or fit.