I'd say its off as I had a new dump pipe fitted its the smallest beanie I'll check what size for you.
cerntainly keeps the aux battery cooler, just for that reason alone ,it must be good.
http://www.ebay.com.au/itm/400770282...%3AMEBIDX%3AIT
As for a light aircraft engine V a ZD30 I would think you would have a shut down protcol for engine longevity