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I still think he should just stick his head on the ground and see if he still has secondary cats. In my experience, without those on the earlier cars it smells a little at idle. I know he says stock exhaust, but perhaps someone cut out the secondaries. Mine came that way when I bought it.
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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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