To answer the original poster's question - the only source for a 3.8 X-51 motor is Porsche - anyone who does the swap for you would need to get one from them, unless they have a spare 3.8 M97 laying around and want to do the X-51 modifications to it.
Quote:
Originally Posted by harryo2b
Really...special attention? From what insiders at the factory told us is that the engine is broken down and rebuilt to meet the specific +/- power%. Gone are the days of the "certain builders, building stronger motors".
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A 3.8 X-51 motor might just get some special attention, since it's a special order item with many different internals (cams, intake, pistons, etc.) from the stock 3.8 that goes into the Carrera S cars.
brad