I just finishing reading the review of the C63 P31 in this months Auto Eclectic magazine: HERE starts on page 44

So I am curious do you guys think the P31 package is worth the money? The photos in the story make me really want this car, sweet smoky goodness.....

 

Simply put... yes

 

You can read more on your inquiry in the C63 section of mbworld.org

 

A C63 with a forged rotating assembly...holy nitrous kit!

 

Just put a deposit on a 2011 C63 w/ P31. If you are looking used and to save money you can get the 09 with P30 package, same thing without the engine upgrade. It is a very strong motor, and with a tune they both get to the same amount of power. But if you are leaving stock i would go for the p31 you get the 30 extra hp. And I hear they are under estimated from the factory... that they are closer to 500hp

 

If you have the extra bucks, its worth it but don't forget to add the LSD which is no longer included in the P31 package. Or buy a used 2010 or earlier and upgrade the ECU for the same result for a lot less $$$ (of course you can kiss your warranty goodbye).