Manifold Pre-Heat Gaskets (Large Hole)

Description

Use one of the large hole gaskets on each side for a stock muffler or any aftermarket muffler with a high and low pressure side to make exhaust flow through the muffler, rather than push back and forth through it. For the aftermarket headers with basic ports, use a large hole on one side, and a small hole gasket on the other to help the exhaust flow from one side to the other. Which side you install the small gasket has no bearing as firing order pattern is the same either way