Hi i have a 2012 srt8 392 challenger. im new to the building up your car area i know my way around a car and how to fix things but i have no idea what performance parts are good or not. I've been told by friends that the first thing i should do is upgrade my driveshaft then do forged internals. i would like to know what kind of driveshaft is already on my car and what internals are already in it, ive been researching for answers but couldnt find any solid answers. plz help.