This Honda Z50 K0-K1 chrome exhaust diffuser (stinger) is a new item. Unlike some of the cheapo versions that are out there this one was reproduced from a NOS sample and is made to full original Honda specs with a nice chrome finish.
This little stinger is specifically designed for the K0-K1 models with the straight pipe outlet but will work on the K2 versions as well... it just won't have the slight bend on the pipe outlet. It seems Honda changed the diffuser on the K2 just slightly with a VERY small 20-30 degree bend in the final 1" of the pipe in an attempt to "side vent" the exhaust. It was really nothing...
Honda had 2 part numbers for the diffuser... the 18314-045-670 was for the K0-K1 version... and the 18311-045-671 was for the K2 version. Both parts are NLA from Honda...
Note that the diffuser is a pretty precise fit in the mufflers we sell, and some filing/die-grinding may be necessary to the muffler ID to smooth any excess weld. Easy to do, but that's the way it is. Otherwise fits perfectly.
A fine piece for a fine price. I will answer questions promptly, thanks for looking.