Features: Premier series packing is made of fine interwoven fibers that have been blended to FMF's specifications for high heat resistance and sound absorption Standard packing works great for M/X applications where maximum sound absorption isn't necessary FMF PN: 010590 OTHER P/N: 79-1125, FMF12-004 Please ensure fitment prior to purchase. If you have questions, please contact the seller. Not responsible for improper or ill fitment due to incorrect year, make & model given by buyer upon purchase.