I have an older stainless set on my 99 ZX6, dual cans. I like it very much, and it was cheap, which was important to me when I got them a few years ago. That being said they've been on the bike for 3 years now and the rubber for the mounting bands is cracked and brittle, and they didn't come with any kind of instructions that were worth using in the real world. They are very similar to these Kawasaki ZX600 ZX6 NINJA 90-01 SS70 Stainless Twin Muffler Exhaust Silencer Set, the outlets on mine are smaller.
2005 Honda 919
I've got a lot of places to see! (on the bike) :-)
I've got the CF version. Looks great and sounds good, pricing is right as well. The baffle can but cut down to get an in-between sound. Full open is what I like but could be too loud for others. With a full baffle, it sounds just a little louder than stock.