The AFE ATLAS 5" Aluminized Exhaust System w/o Muffler (Downpipe-Back) 49-04007NM flares to 5" directly after the downpipe flange.
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An upgraded performance exhaust system can be installed on a completely stock truck. Performance exhaust systems increase exhaust flow by eliminating the restrictive stock muffler, replacing factory crimped bends with smooth mandrel bent tubing, and increasing the overall pipe diameter. The benefits of increased exhaust-flow are reduced EGT's (exhaust gas temperature), increased horsepower/torque, increased fuel mileage, and a that deep throaty diesel sound.