i put the afe stage 2 and a banks compressor wheel in ove the monster exhaust and 2 chips....wow is this sucker one loud whistler. it also gets a massive woooooooosh when i lift my foot off the pedel. my 15 yr old son tells me the truck sounds awesome but after driving down I95 for 12 hours i want to pull the hair out of my head the whistle drives me nuts. but beepbeepbeepbeep it sure does sound cool.....yahhooooooo