Quiet mufflers

Yessir. A person could uncork they pipe fairly quickly if they hit a big rock at speed.
I have seen the under axle exhaust tube work well on a fairly stiff suspension big block car. The tube to axle housing clearance is about 2.5 inches. Just inside the shock mount / U bolts. The tube to ground clearance is 4" exactly. The rear tires are 27 inch tall and tread 255 mm wide. So, on that scenario the left tire would have to drop off in a 4.5" deep 12" wide by 20 " long pot hole to bottom out on the exhaust tube. Also, we dont drive it dukes of hazard style since its in mint cond.
So it sees smoother gravel roads and highways. I never take it into a ditch full of rocks and trees or into san francisco. Both of which are similar driving environments for the chassis.