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Brutal Legend
Secondary Quest Goodies:
Increased Nitrous Power - Beat all Racing Missions
Steel-Quilled Axe - Beat all Hunter Missions
 

Mouth of Metal -- Radio Player for The Deuce:
To find the Mouth of Metal upgrade when free roaming in The Deuce, find a spot with red flowers around a metallic relic/structure -- this is the entrance to Motorforge. The first one can be found just northeast of Bladehenge. Play the Relic Raiser and then enter.  Enjoy the cut-scene and your prize.