the older shorties you can see through. I have a set that were on my SM. They are unaltered and you can see through them from one end to the other. They are kind of like the old glass packs I used to put on cars where there is an inner tube with packing around the outside but no offset baffles so you can see right through no problem.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!