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That's a 99 engine (X marks the spot!). Does the engine serial number in the ECU (read with durametrics) match the physical number on the engine? If it was a factory engine replacement under warranty there is supposed to be documentation and or a label placed in the cars manual in the service records section. That was the proper way they did it - unless the swap was done by an indy who just sourced an engine somewhere. If your engine serial number in the ECU data area matches with the number on the block odds are that the engine wasn't changed OR a dealer did the change and properly recoded the ECU to reflect the new engine number - but still - this new engine number should have a sticker/info label in your manual to reflect the change if it was done properly. What evidence is there to suspect an engine change? Don't go by the engine mounts as someone may have installed 997's either by accident or they got a deal on them as there is little difference between the 996 and 997 parts.
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1999 996 C2
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