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Thanks for posting this up. That K29 is one big turbo - 750 BHP at the 'bottom' of the hill ? Is that a rhetorical question? :P I think the 1985 car was rated around 550 hp. The two turbos I have are from Early June 1985 and were used in Test runs. They're #9 K27 hotsides with a K29 coldside using ...

The S1 uses a K27 based turbo. The RS2 is all K26. They aren't the same and won't even bolt up to the same manifolds. The K27s used in Audis were either the 55mm round Audi type flange or the standard K27 rectangle same size as a garret T4. The K26 is 50mm round hole like the RS2 manifold, S2 manifo...