I have a 2011 Dodge Charger RT. Im still new to modding. I currently have a K&N cold air intake, a Hurst elite catback exhaust, also have have Itune Diablo 91 octane tune(running 91 octane fuel also). It runs fast. I just want to know what else I can do to bump up the speed to keep up or atleast meet with a 392. Also I updated my diablo tuner but I can only get 91 octane. The 93 octane isn't a option. Should I put back my default tune and reset the tuner to see if it will give me the option of 93? I was also thinking to get headers but idk if I should get shorties or long head. Freind a mine said I should run shorties. Only put long head tunes if im pushing 700 hp. Which im currently am not. Any advice?