Not sure if this is the right forum, but I have a Bobcat exhaust air purifier used on a S185. It has 18 hours of use and is in great shape, aside from the minor use marks from bolting it up. We got it for an indoor job requiring it but no longer use it. In a nut shell it takes away much of the emissions allowing for a cleaner worksite. I must say it works really well indoors which is what I assume it's for. According to bobcat- "reduces Particulate matter up to 40%, Hydrocarbons up to 80% and Carbon Monoxide by up to 90%." Here is the link to the Bobcat brochure http://www.google.com/url?sa=t&rct=...koHQDA&usg=AFQjCNHSWu-fmFdZZB2McF1JO0m4ndudbA Asking $800 obo, also may be looking for a trade for Skidsteer accessories particularly a snow bucket if you are in the area. These go for $1200 from the dealer. We will also provide the model/serial # We are out of Bloomington MN but can be shipped if needed.