Boost-Monkey Ultimate N54 Down Pipe Hardware install kit Bolts (Bolt Kit Only) For aftermarket down pipes on N54 and N55 Motors E82 E88 E89 E90 E91 E92 E93 E60 E61 E71 F01 10.9 Grade bolts - minimum 150,000 PSI tensile strength. Blue Zinc Coated for rust protection Includes Nord-Lock washers so your pipes will never rattle loose again Highest quality components available on the market Boost Monkey approved