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Only Shells I Need Are in My Guns is a challenge found in Badass Crater of Badassitude in Mr. Torgue's Campaign of Carnage. Players are tasked with completing a racing mission with a Tier 3 difficulty within 1 minute and 45 seconds.
The mission is started near the southern edge of the zone at a battle board. The Afterburner will greatly help with completing this challenge. This is relic increases boost capacity, boost recharge rate and decreases boost recharge delay.