FLO~PRO 4" Cat Back Duals 01-07 Duramax 6.6L Dually
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For those who want the look and sound of a full 4" turbo back kit but want to retain the factory Cat, this is the kit you want. Each Kit comes with a FLO~PRO pass through style muffler for increased performance, and all required hardware for installation. Will only work with dually trucks.