A bit more on subject, if it weren't for Jaguar, where would I go for an affordable, V12 powered GT? My XJS has exotic European cool without the massive price tag that comes with a Ferrari, Lamborghini, etc.
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I don't think that installing a catalyst on an older vehicle is realistic. The catalyst requires very tight fuel control that just does not exist on pre emissions vehicles. I expect my 53 Mercury flathead would plug up a modern catalyst in short order. A modern feedback fuel injection system would be required, at a minimum. Upgrading an early catalyst to a modern catalyst is much more realistic.
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