I have 5 inch also with a 4 inch downpipe, LOVE IT! It'c actually kinda quiet until you mash on the loud pedal! As far as whistle, sounds like a F-14 firing up AND shutting down!
I have a video of my 5in non vgt.. On my Facebook... It was deafing .. I've passed cars at 3k and people would cover there ears.. Plus non vgt sounds evil
I tried posting a video of my 5 inch from my phone straight to here, it never would load. On my truck, at idle, it's kinda quiet, until you mash the loud peddle. Then it's a whole new beast! VERY VERY loud!
I'm a little late to this thread but here is mine with a 4" Turbo back straight pipe exhaust from MBRP. I love the whistle I get and there's no drone either. https://youtu.be/fXFsc8FaTjU