Slant 6 Turbo 68Dart Project

i have 3" flex on now. it doesnt bend well as you can see in the picture. got it at advanced autoparts, it was an exhaust repair kit. came with two clamps and 18" or so of the flex pipe. the 2 1/4" pipe i had on with the headers was much more flexible. the brand may make the difference but i doubt it.