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For sound just google "laguna pipes." Plenty of examples out there. They tend to work decently well depending on weather, and if they don't fully work you can get away with lifting throttle a little bit when you go past the sound booth. And not trying to be a smart a**, but the next best thing would be to go back to stock exhaust since that has a muffler that is specifically designed to reduce engine noise on your car, but you still might need some sort of laguna pipes to pass sound even with that (as some other members have found).
I personally don't run a rear tow hook, but best bet is probably to either get a rear hitch like you mentioned or there are also kits out there where you remove the license plate to reveal a hole where you can thread the tow hook into the crash beam. There's not really any good structural part to attach to besides the crash bar on the rear which is why there are limited options.
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2017 SS 1LE.
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