Here's a pic of the diffuser. It's a generic diffuser off Amazon. I did it mainly because my new exhaust melted the bumper but I was pretty happy with how it turned out. Happy little accident lol. It was pretty straightforward - 30 min with a Dremel to get the sides to match the contour of the bumper, then wrapped all the way around in rubber U channel to give it a bit more of a finished look. I had some mounting clips left over from another project that are designed to hold screws in thin plastic, and just made sure that everything was concealed under the u channel.
I saw a video of a guy selling a $3500 "custom" rear bumper that was essentially two of these, one on either side of the center exhaust. It looked nice. Not $3500 nice though (the part cost me $25!)
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