I just picked up a new XR650R and am in the process of ordering the parts to uncork it. Does anyone have a comparison between the stock exhaust with the hole saw mod and the stock exhaust with the replacement spark arrestor? If they are "exactly" the same I guess there is little reason to buy the replacement, since it is unlikely that the stocker will ever go back on the bike. Although, it is always nice to be "able" to make the bike stock again. If the replacement is even a little more quiet than the moded stocker that is likely the way I would want to go. Any advice?