To save some $, drop in a dry air filter like aem or k&n these trucks have a cold air intake basically, unless you want like the open cone type k&n air kit and are like $350(look at the oem box, looks like a cold air just not fancy unless you go to car shows). Exhaust won't add horsepower, but will add sound, I would save the money and if sound is what your after, do a different muffler or deleat. A hellwig rear sway bar is like $300 and can be installed in less than 45 minutes, no need to jack up truck and makes truck handle like a dream, love the sway bar, I can take corners like a car now, sway almost gone. I had leveling puck in my truck in front(21 bighorn 5.4 4x4) and ride was terrible, I removed puck and had bilstein 5100s that are adjustable to level front. With the bilstein 5100s and hellwig sway bar, feels like it is supposed to, responsive, handles excellent. I just got my truck a couple months ago, but had a 4th gen ram(x2) before this 21 DT. Tomorrow installing front bushings(energy brand $30), the front sway bar is heavy duty on these trucks, unlike the rear. But they use a softer bushing on front, so they wear in as little as 35k miles and the energy bushings are a solid poly type bushing, will last much longer and tighten up movement for better front response and is cheap, 2 bolts on each side, cut old bushing off, replace. I have a flag decal I need to install in middle sliding windows still. Bang for buck, the bigger rear sway bar is one of best mods I have done to a vehicle and is good price. Enjoy, I would save the money on intake and exhaust and get a tune, will be way better and noticable difference, good sound can be had for very little, no need to replace entire exhaust. I have thought about getting the electric muffler that can switch from normal to open exhaust, think its like $500 for the kit, then you have best of both, sound or quiet.