K&N Challenge Series is a breath of Clean Air!

Have you finished Stage 3 of The Run yet? If you have, you might have noticed the K&N Challenge Series, which contains three extra events: Filtered For Success, Death Valley Run, and Battle in the Desert. As an added bonus, achieve Gold in all three events of this Challenge Series, and unlock the gorgeous monster shown above -- the K&N Signature Edition Dodge Challenger SRT8!

There's also something else, but we'll tell you about that later ;-)