I've been told by a local indy shop that installing headers on my 3.0 after removing the front cats can get me 20 more horses. We don't have emissions testing here in SC, so removing the cats is legal. Is my indy just feeding me a pile of horse droppings?

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2003 E53 3.0i
DOB 10/15/2002
Sienna red, Savannah Beige Dakota leather
Type FA53, Engine M54B30

2018 G02 30i
DOB 4/21/18
Black Sapphire Metallic / Canberra Beige Vermasca leather
Engine B46O