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The combo is street car: 440 with cnc stealth heads, 528 solid, 3000 stall, 3.55 gear. It runs in the 12's with 2.2 sixty foots and no traction at all. Should I dynamat it and keep the muffs?

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I'd probably pick Hooker Aero Chamber mufflers if it were mine, and would look into some better tires

That said I have 3.5" ultraflow welded on mine, but you probably wouldn't want them for what you're doing