Im not sure as I havent tested that many pipes. But I never had a bent stinger until the rdlogic.
I couldnt see a bent stinger being good for performance and its just an ugly eye sore to me. Also yeah mine has the dent to go along with the bent stinger. But if your a good driver and have a wide track im sure it shouldnt come up too much. Most everyone I know with an rdlogic has bent it. But your right other pipes do suffer the same....just not really sure which is less durable. Thats why rather than play which pipe doesnt bend. I just went with the one I know wont bend.