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There's no way you're picking up 15HP by removing the secondary cats...it's solely a sound modification, nothing performance.
As others have said just doing a catback will not require a tune at all...and nor does the secondary cat delete...I believe they're on there just for KKKalifornia emissions but GM said screw it and just had them on there for every car.
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2018 Redline Edition 2SS- A8, NPP, MRC, Recaro seats, ECS Novi 1500 tuned by EFX, cat deletes, Mighty Mouse Wild CC, GM STB, smoked ZL1 3rd brake light, Xpel XR Black 35% tint all around, Street Scene front splitter, C7 Carbon ZL1 side skirts Drake Muscle Car wicker bill, Adams Polishes Ceramic Coating
2010 Infiniti G37x Sedan for the DD.
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