Mandrel bending versus regular

would love to see a real world comparrison of the two. i would think that mandrel would definatley flow better though. my 3" wasn't mandrel bent and it looks good until the tail pipes. it kinda flattened out over the axle and had a kink in it. after the new rear suspension was installed we bought 2 1/2" J bends and made tail pipes from them. the are mandrel bent and look a ton better and i would bet that the 2 1/2" flows as well if not better then the squished 3".