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This has been gone over before, I believe in the original post detailing the release of the rallye model. The engines built for rallye cars aren't designed to run 100k miles like the public versions are. They're designed to last 30-60 hours (Someone correct me on that, I'm just guessing that's seat time for a racing season) - to complete the season, and then get a complete rebuild.
So sure, they probably work the cam profile, and piston size, and etc etc, but it doesn't matter. We couldn't replicate the power numbers without making the engines incredibly unstable for long-term use. Now if you have a team of mechanics willing to tear your car down every three months to rebuild the motor, go for it.
TL;DR: Race engine = not built for long-term drivability, built for short-term go-fast and then it gets rebuilt. Unaffordable for average joe.
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