Mr. X, I wish you well, but it’s highly unlikely that someone’s going to sell their Canon Exhaust. In the 10 years I’ve been a member of this forum, I think there’s only been one member here who was trying to sell his Canon Exhaust. There are a few different options available that would allow you to order the 6” Canon Exhaust. You can order direct from REVO, from/through MeanCycles, or from/through eBay. That exhaust is extremely expensive, which is probably why you’re trying to find a used one...and I don’t blame you. I’m not trying to come off as a pessimist here, but you’re probably going to have to bite the bullet on this, and absorb the full and exorbitant cost of the 6” Canon, if that’s the exhaust you want.