Mine are chromed steel. Living in Southern California I don't have the problems with snow and rain like some do. This Cruiser is not my "daily driver" either. My lake pipes are 60" not 70" so that they fit under my E & G running boards. That length is also more appropriate for my late'50s street rod look. The 70" pipes were used mostly on customs in those days.[8D]
If I had to drive through snow and salted roads, I'd have the stainless steel. I'm not sure, however, if the caps come off the stainless steel pipes. Another problem for me is the fact that no one makes stainless steel pipes in 60".
These are the Mooneyes clamps that I used to install mine:
Here's a picture of my Cruiser:
