in my 2004 Yukon XL with the 5.3 Vortec Flex Fuel, I'm running two 1400 watt pioneer 12's and 2 1000 watt Pioneer 10's, feeding them with a 2400 watt D Class Mono-block Kicker Amplifier. I intend to upgrade all of my door speakers as well as the little Baby tweets in the pillars, whick I will...
Please help me figure out what in the blue blazes this thing is and what I do with it. I find it nowhere online, nor inside of manual, official GMC, or otherwise. It driving me up the wall trying to surmise it's name and/or use
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