I would readily expect there to be a problem at high speeds for the exhaust. The ends of each muffler are so sharp, that I would expect heavy wind deflection and pushing of the muffler up and out at higher speeds. Notice all exhaust choices have rounded mufflers.
I do believe a wind-tunnel check would be best, or else it may seriously cause some problems to people at high speeds. That little edge may make all the difference.
P.S. I am assuming that the edge is sharp towards the middle of the car as it is on the outside. If not, then disregard the post.
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