BBR (Brodie Brittain Racing) did the "official" UK conversion of the MX-5/Miata years back. Took the power from 115bhp to around 150. BBR also did (do?) a 232bhp variant.
The 150bhp took 0-60 from 8.7 to 6.8 secs. 232 bhp version does 0-60 in around 5 secs and 0-100 in 11.2 secs. Not bad going at all.
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