Exhaust Systems for the 2004-06 Pontiac GTO: axle-back mufflers, full cat-back systems, downpipes and front pipes, mid-pipes, valve simulators and muffler deletes in T304 stainless, with chrome, black and carbon tip options. Exhaust is the one upgrade you hear every single drive. Everything on this page is confirmed for GTO fitment.
The 2005 update added the twin hood scoops and moved to a split dual exhaust with a revised rear valance, so hoods, rear bumper pieces and exhaust are sold 2004 or 2005-06. Doors, decklid, front fascia and interior are shared across all three years. This page covers GTO (LS1) and GTO (LS2); each listing states the exact trims and model years it fits.
Materials run T304 stainless steel. Systems are mandrel-bent and TIG-welded; each listing states resonated or non-resonated and the tip finish.
Frequently asked
Will I get drone at highway speed? Resonated systems here are tuned to stay quiet at cruise and open up under throttle. Non-resonated and muffler-delete options are louder throughout and say so.
Do I need a tune? Axle-back and cat-back systems are bolt-on with no tune required. Downpipes and header changes are the only ones that may need one — each listing states it.
Browse all 2004-06 GTO parts.