I'm close to buying this exhaust, BUT

[Cormanus]

InLine4, far be it from me to contradict Chuck Wilburn who ought to know way more about this stuff than I ever will, but I've follwed the discussions here fairly closely, and I don't think he's quite right.

At the heart of the CB is it's ECU controlling a whole range of things, including speed and rev limiters as well as fuel mixtures. God knows what else it does.

If all you want to do is change the fuel mixture mapping, a PCV plus a tune ought to do the trick as they can create a custom map for your bike. The speed and rev limiters will still be in place. So, that far anyway, Chuck is right.

If, however, you want to remove the speed and rev limiters, you must have your ECU reflashed. A PCV cannot do that for you. A reflash can also change the fuel mapping. If you get the person who does the reflash for you to put it on a dyno they should be able to create you a custom map.

There's nothing to stop you getting a reflash and installing a PCV. Indeed, if you wanted to keep playing around with the fuel map that may be the best option unless there's a reflash artist around the corner from you who can do it quickly or you can find a way to get into the ECU via your own computer—and I'm sure that's possible.

In summary: a reflash can do all the PCV can and then some. If you're happy to live with the speed and rev limiters and just want a custom fuel map, a PCV will do just fine.

Have I managed to make that clear or just added to your confusion