Outburst is a 
Torgue Repkit.
Its special effect is Flare Up - On use, each Torgue Sticky immediately deals X Damage and provides additional Healing.
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How to Unlock The Legendary Outburst Repkit
Legendary Loot
Repkits
Overview
How To Unlock
Unlock Location:
- Progress through the Bounty Pack 5: Amara and the Vile Shadows DLC until reaching the Optional Boss Boss Name.
Farm Method:
- Defeat Boss Name to get a chance at the Outburst.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Boss Name until the Outburst drops.