Corsa 2002-2006 GMC Sierra Denali Ext Cab/Short Bed 1500 6.0L V8 Polished Sport Cat-Back ExhaustCorsa 2002 2006 GMC Sierra Denali Ext Cab Short Bed 1500 6. 0L V8 Polished Sport Cat Back Exhaust dB by CORSA's patented Reflective Sound Cancellation(R) (RSC) Technology allows acoustic engineers to create a drone free exhaust sound, and a deep aggressive rumble. Computerized; mandrel bent; straight through design for maximum airflow which improves fuel economy and performance. 3. 0in. Cat Back Single Side Exit with Single 4. 0in. Polished Slash Cut