I can remember talking to a guy from HMS Tireless after he came back from duty he was exercising with the chilean navy and was against one of thier oberon class submarines, the chilean beat the traffie 3,2 the oberon despite being over 30 years old out did the traffie which was a nuke and alot younger.
All diesels are quiet even on the old tangos and whiskeys and kilos but the conventionals cant go for long periods of excess speed id immagine the AIP submarines are similar but they can go for much longer at faster speeds it wouldnt surprise me that the type 212 / 214 submarines could hit 33 knots at full wack.
Also a further note india retrofitted one of thier kilo class submarines with an experimental 7 blade propellor with that and thier superior indian batteries that said kilo hit 27 knots but the cost in battery life went through the roof after half hourish of flank speed the battery was quite litteraly dead.
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