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I'd estimate about 12-16" on centerline in the tubing. What codes do you have? Changing O2 sensor feedback in the tune likely won't clear the codes, if they are the ones I assume you are showing. As a last resort, if you need stock manifolds and cats, I have a set I could sell to you.
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13
Mods being installed-
oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc.
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