CHEV 229 262 V6 EXHAUST MANIFOLD GASKET SET # MS15251 Port Style: Stock Gasket Material: Composite Quantity: Sold as a pair. Mahle Original Exhaust Gaskets Leaks in the exhaust manifold produce bad exhaust valves, a loss of power, and increased fuel consumption. Mahle Original exhaust gaskets require metal beads where the gas passes through at very high temperatures and low pressure. These metal beads are reinforced with metal sheets to resist the component movement that arises from large fluctuations in temperature.