The Goat was running an internally untouched LS1 that was still spewing gases through the stock exhaust manifolds and catalytic converters. Before even thinking of pulling a valve cover, we wanted to ...

Intake enhancements are only as good as the exhaust allows them to be. All the air and fuel in the world on the intake side won't make more power if the exhaust system can't pump out the by-products ...

With bolt-ons including Stainless Works headers, our 2005 GTO project previously made 375.9 hp and 372.7 lb-ft on SLP's Superflow dyno. Then Stainless Works bolted up its new 3-inch exhaust system at ...

The 1967 Pontiac GTO occupies a rare place in automotive memory, where nostalgia and hard numbers align. It was not the first fast American coupe, but it distilled the emerging muscle car formula so ...