Best bets are DIY intake, (30 to 50 bucks, and less than an hour) straight pipe the stock exhaust (free for me, had the pipe and welder in the garage, about 3 hours) and then some gauges, (about 310 bucks with "A" piller pod from summet, took about 4-6 hours, spread out over a week or so). Next is tunes, DP tuner is where I'm gonna go...
Good luck, welcome to the org! Happy New Year!