I would think bigger is better, Hardrock & modquad makes them,(PLUG) But the angle of them, well are you going to tie them back into the frame (ect) then you can make them bigger. Also remenber, (force) does'nt come into play,(just drag) well most times. Till you hit 80mph. IMO Short times are no-prob-lem-o
I have a few tricks that I have done to mine. No pics at this time.
later