[christofoo]

Getting off-topic now, but be careful with insulation around the cat. In that ref they used vacuum insulation with a hydride that foiled the vacuum at high temp to avoid meltdown. That approach isn't for the faint of heart, in this case even the pros messed up on outgassing and permanently spoiled their vacuum. Also of interest is their use of a phase-change-material (Aluminum) for heat retention. (Phase-change = molten, another thing we enthusiasts should be pretty careful about.) I've been wondering if a vacuum insulated cat is available OEM yet, and if it can be retrofitted on older vehicles - can't seem to find it.