Update, I drove the car all the way to oceanside and back in the heat of the day which is like 1 hour each way. Scanguage had the water temp at about 209 which is normal. I'd imagine that would have the exhaust as hot as it will normally get and there was no melting or warping
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I've also been over a variety of speed bumps driveways and the likes that operate the suspension and it looks like the bellypan hugs it quite nicely even when it's traveling up and down. Yay