2014 mustang street race track race mod list

I have a 2014 mustang gt/cs with pypes Xpipe - bbk cold kit itch will be replaced soon for a jlt - and a bama 93 octane racing tune... with that being said I ran a 12.48 at 114 threw a 1/4 mile im wondering what up grades I should buy next on a low budget to gain hp or a faster time I also...