Has anyone any experience with the heady duty canister air cleaners? I know they require very little maintenance, and can be used for extended periods. Do they give the engine added protection or power? 200 hours more life, or 1000 more? Clean air in to the motor greatly increses its life more than any other factor except oil. Do the canisters actually give a signinficant increase in engine life? Do they increase power? I am considering adding them to 17-25hp engines..