I have seen a great deal of interest in the 372 muffler modification on this forum. I think the individuals that want a little more from their saws realize that this is the first step in realistic performance gains. In that regard I have 4 or 5 stock mufflers than I can sell. If you are wanting to do the work yourself this will give you the opportunity to do so and still retain your stock muffler. If you want to go back to stock, to sell the saw, or go cut wood in a place restricted to stock mufflers only, you will have that option. If you want me to modify it before I send it, that can be accomplished also. That way you will only have to change mufflers to enjoy the increased performance. These mufflers are complete with the lower bracket that secures them to the saw. Contact me if interested. BTW I have other 372 parts available. Mike