What, you may be thinking, is this doing here? It’s clearly an E46 CSL, and they did that one. Built 1,383 of them in fact. It was the first M3 to have a carbon roof, accompanying the famous carbon airbox. The greatest M car there’s ever been, some say, certainly the one that epitomises M’s brand values most faithfully. The most accurate expression of Coupe Sport Lightweight, too.
Its beating heart was the famous S54 3.2-liter straight six, producing 360hp (the extra 17hp thanks to its freer breathing).
But not this one. This one is pure skunkworks. M never had any intention of presenting it to the board.
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Because it has a V8 in it. Lord alone knows why, but somehow they’ve crammed the E39 M5's S62 400hp 5.0-liter in here. The packaging is just ridiculous, the clearances measured in millimetres. Maybe it started as a ‘bet you can’t fit that in there’ joke and someone ran with it.
I started it up and drove it around – it’s angrier than in the E39, revs and responds faster. Remember they did an M3 GTR homologation with a V8, 10 cars built for the US market? An entirely separate project apparently, as that used a race-tuned 460hp 4.0-liter motor. This, you get the sense, was for internal enjoym… er, use, only.
You expect this Frankenstein to be crudely finished, but of course it’s not, so I expect the suspension was altered to rebalance the dynamics. It's subtle work, the only outward sign an extra hole on the right hand side of the bumper, the standard CSL famously having just one.
But here’s the bit I like best: it’s covered 30,000km. Someone was clearly having fun with it.
NOTE: This article first appeared on TopGear.com. Minor edits have been made.
