i'm lookin for a can for my 04 F6. not many companies are showing any availible on their websites. what's the best/ loudest one you guys know of? i was lookin at D&D, Speedwerx, MBRP, and Black Magic. if there are any others, let me, know. any help would be greatly apreciated. oh, also, my F6 is efi, will i have to do anything? or should it be fine?