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. Shoot me a message if you have any questions. 


Bulk discounts available. 


Thanks for looking!