Re: Exhaust cutaway on rear bumper.
I would just replace the lower cladding with the one from the V8, it will look more finished. That part is not expensive ($150 maybe) and its not too hard to install.
2014 Jeep Grand Cherokee Overland V6 4X4. Maximum Steel w/ Vesuvio Jeep Brown/Indigo Blue. Advanced Tech Pkg.
2013 Lexus GS350 AWD, Liquid Platinum w/ Flaxen. Luxury & Cold Weather Pkg
Previous Jeep: 2011 Grand Cherokee Laredo X w/Nav, QT1 & Trailer Tow