The Bowman ring is just a super high quality product that he makes by hand. No kidding, he makes a ring for most any engine you can think of and that's great for some that are out of production. Most users say they break in quickly and show an increase in compression. It's just a fun thing to do if you need a new ring or are finicky about your engines and want the most out of them. Some even say they idle better, especially after doing the reed block modification that he recommends on all the chinese, reed valved, 2-strokes. Run a search for that and you'll get pictures to go with the process and everything. It's just a matter of getting the reeds to seal flat against the block like they're supposed to do at rest. What I wan to know is how he goes about making a ring!