Quote:
Originally Posted by dc503
This part is driven by the ACO GTE engine regs, turbocharged motors cannot be larger than 4.0L. I don't believe this is a brand new ground up motor, although I could be wrong. The now old M6 GTLM didn't need to adhere to this.
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I think you may be right. The original post makes a couple references to the "production engine". I'm going to take a guess and say it's based on the S63 and destroked from 4.4 to 4.0 liters.