I still have the 3-1/2" under my Charger with a X Pipe to 40 series 2 Chamber Flowmaster Mufflers reduced to 3" up over the axle out thru the stock tips. It has always been loud but not obnoxious & I always get a ton of compliments on how stock the car looks but idles & sounds so good. I did add some 3" cheery bombs on either side of the gas tank before the tips recently and it did quiet it down some & get rid of the drown it had around 45 MPH.