You are looking at a Big bore head pipe gasket for factory pipe products B pipe. This gasket fits all B pipes and many other models. Most 3 bolt style head pipes are the same. This big bore gasket has an inner diameter of 51mm (stock is 48mm). This gasket is a perfect match for ported exhaust systems. The gaskets are 100% fiber material and 0.030" thick. Our gaskets are extremely high quality and made in the USA. If you have any questions or need additional parts request feel free to send a message.

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