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I didn't feel it'd be worth it for a 998 as it adds loads more complication, I'd need custom manifolds, mounts, conversion kit, cams, and it'd take up loads more space making everything a bit hard not to mention the cost. looking at nearly 2k for that conversion without the forced induction bits.
I did consider a 7 port 8v head but I don't think even that would be worth it as it'd put the inlet ports facing forwards and that makes it hard to fit a plenum in the front of a roundnose mini and for once I don't really fancy bits sticking out the front. Gotta keep it stealth.
Money no object mini would be a 1275 bored and stoked to 1460, KAD 16V head, twin turbos and EFI... but unless I win the lottery and build a sick machine shop that won't happen.
IR-
Get a K11 micra and put that engine in. As it's basically a development of a licence built A series (it even comes in 998 or 1275 sizes) it'll fit without sheet metal mods and once you lose the catalyst and put a proper exhaust on it's good for 100 reliable horsepower. And with a 5 speed box as a bonus.
bq
If you're doing all that work, then surely it would be rude not to add a quick BMW K-series 16v head swap at the same time. Make the most of all that 'charged air.