Everything you can afford! lol I put another almost 15k in my truck in upgrades power wise and aesthetically. CAI, piping, TB, Turbos, BOVs,IC. downpipes(not installed yet), exhaust, tune and tuner, bed rack, maxtraxx, sound system, epic seat covers, grill, lights, front and rear bumper, rims and tires. Oof that’s a list and not all at once this took maybe first 3-4 years of owning to complete and as you see still have downpipes to install. I don’t race only use it to hunt lol but I like fast from my years of a younger lad driving a skyline and other tuners then first truck was a supercharged 2010 raptor.