Interesting thread. Being a newby, not having raced since the 70s, some of the Gasser races I attend, started posting on their webpage/FB that a diaper would be required. I purchased the cheap Jegs strap style diaper. As mentioned, I could not install at all without complete tight contact between headers and oil pan. The material used appears to be the same material that is used to fabricate skydiving parachute containers (Im a parachute rigger and former skydiver) and without doubt, will burn and melt. I suppose that even with a burn hole the diaper would collect a majority of the oil that may be blown from the engine but the material also smells like its burning while its melting. As it turned out, none of the tracks so far are enforcing the diaper rule, but it seems to come up every time I travel to a new track. I think that only a custom made diaper for a rear or front sump oil pan made with fireproof material would actually work, and seeing as how the "HUGE" payouts for Outlaw gasser racing don't exist, Ill race till they tell me I can't...that's my plan and Im sticking to it....