When you get an exhaust, your paying for name and sound. If you look up exhaust with the same design your going to get roughly the same gains give or take 1-2hp/tq i personally believe in the theory that things travel faster in a straight line so I personally would recommend the catback exhaust design vs the axle. thats a pretty hard bend when it reaches the axle back portion. I am also having a hard time finding actual info and not just claims. sucks but the car is still very new.
Good luck man. If you dont mind the axle back design check this one out if you havent already:
gthaus.com
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