I have the full rear seat husky liner and haven't noticed any negative effects. I did put two hard foam spacers inbetween the sub and the mat to ensure there was no additional noise though.
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I installed mine a couple months ago the tools referenced from amazon worked great. I ordered something similar prior to install. I am happy with the sound quality as well.
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I believe Crutchfield has a how-to video that you can use for the install. The sub by itself is only like 527.00 linked to price. The video link from Crutchfield is LINK. I still cant decide if I want to pay the $850.00 for the full upgrade.
I am thinking about puling the trigger on this do you guys think it is a good deal?
http://www.shopgmcparts.com/electronics/2014-sierra-1500-audio-upgrade-kicker-powered-amp-and-subwoofer-kit/gm/19303117-p-1333.html