I have a car we are building an engine for that does not have the X51 (and has data) I'll make it point to ping you back with what I find when the new engine goes in with data.
Typically.. I hear people comment about the X51 and say "it only works with the other pieces".. those are typically 996/997 people. Having the engine hanging off the ass end of the car presents another set of oiling issues. I believe.. the X51 helps out a LOT. Can it be better? yes, but for a simple bolt on that is easy to purchase? It works very well.
The X51 keeps the oil from going around the "walls" it seals to the crank case on 4 corners where as the stock pan does not seal.. the oil can go around the plastic walls in a high G corner.
With an S? I'd be more worried cracked heads and IMS failure!!
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