Have a 2016 1500 reg. cab long box, 5.7, 6 Spd. auto., 3.55's, 2wd. I did some research and I picked a K&N cold air system, they made 4 different ones. I chose the 63 Series (they all look similar). Called K&N they said the 63 series is the only one NOT carb compliant and it was a clean and reoil type. It produced the best HP/TQ numbers at the rear wheels. The Exhaust I chose was the MBRP cat back (S5142409) single tail pipe - only $489 - and it is Stainless. Two tail pipes added a lot more$. Sound was listed as moderate. If you are just cruising as in cruse control you almost can't hear it, NO DRONE AT ALL, but step into it and sounds nice (at least to me as all is objective). Unless at a drag strip you can not feel the power difference only a clock can determine it. But in first tank of fuel got a 2.2 MPG increase over stock (also single tail w/resonator).
As side note Loud DOES NOT = HP. Open headers are loud but increases in HP/TQ. mostly occur at upper RPM's where most Street vehicles are NOT driven, Heck at 75 MPH my 2016 is only turning 1900 RPM. Exhaust systems do more than muffle they also help to draw fuel mixture into the cylinders to increase volumetric efficiency, making the fuel do more work. (read more MPG). Build your vehicle to do what you want it to do. My 66 sounds scary and nasty, and starts to make serious power around 2900 RPM (at or over 600lbft from there to 7,000 RPM) and only gets single digits for MPG doing it. My Ram if I live on cruise control is doing 18+ around town 21 interstate speeds. Two different vehicles each with a different purpose, but the same operator. Unless the wife is driving! then the MPG go right down the chitter, as she like to HEAR IT.
JUST INFO not a criticism.