Stock exhaust on these trucks flows pretty well. Long tubes are a worthy addition though. There are some decent long tubes that bolt in ( OBX fleabay cheap... ) coupled with an intake and a tune will wake that thing right the hell up. If your going to cam it be careful with AFM it requires special lobes or you can risk failure... I wouldnt bother camming it with your budget personally

But just to beat the PS? A good tune might be enough, never mind the mods.