the bikes that I've used them on have always been ratbikes so I ellaborated anything that could make the performance aspect more of a caricature.  The big cans suit and look pretty good on the over-all setup...as a whole.  But things need to be done with everything else in mind.

On a nice, solid bike I wouldn't do the big can.  Now, slap on a busa rear assembly (swinger, wheels, etc) and a front end, strip all the plastic off, load the front a bit and paint it all a goofy flat/matte black that can would look pimp.