All four Biltwell exhaust tip sets are machined from 6061 T-6 aluminum and press fit inside any 1-3/4-inch O.D. straight pipe perfectly. We recommend drilling and screwing the tip to the pipe to complete installation, but we leave this step to the discretion of the builder. SURFACE FINISH: after CNC machining, each tip set is sandblasted to a dull neutral finish, then black or silver anodized for protection and appearance. After anodizing, we laser etch the Biltwell brand and model ID into each tip. This laser etching is hidden inside the exhaust pipe when the tips are installed.
