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Hiro Toyoda, vice-president of Mugen Euro, has bad news: "Environmental pressures mean naturally aspirated engines are rapidly being superseded by other engine architectures and technologies. We may never see the like of the K20 in a mainstream production car again". Quite.

It would appear Jeremy's words in last month's Top Gear magazine are coming to pass. If we are to save the Leatherback Turtle from demise, some of the best naturally aspirated engines ever built are to be destroyed.