New truck but familiar with the NBS and NNBS trucks as I've previously owned an '07 Z71. Also have an '02 Formula Firehawk. I just picked up an '02 Sierra 5.3 2wd. 170k on the clock. Then blew money on some silicone, cleared the headlights, replaced the blower motor resistor, cabin filter, Kenwood single din deck with USB and 6.5 Kicker component speakers for the door. MagnaFlow cat back going on today as well.