After driving around now for a week and putting 520 miles on my rig after the new exhaust i am delighted to say the least. Turbo spool up is instant, no drone, and no codes. I was worried about the drone i had in my 03 with the 4 inch system and it is night an day different in my lly. The sound is awesome esp. when i put my foot in to it. Just a nice deep growl in the upper rpms, plus that f-16 sound all the time. They should come from GM this way. I am tickled!!