The Ramair Silicone Intake Pipe (part no. RIP-001) has been designed to replace the standard OEM plastic induction hose on the BMW E46 M3. The hose is constructed to provide a constant radius reducing restriction in the initial stage of the intake tract and is a direct replacement for the factory pipework. The hose is supplied with a pair of high quality Stainless Steel W2 hose clamps replacing the difficult to use OEM spring clamps. The hose is made from high-quality silicone with 5-ply polyester mesh reinforcement for added structural rigidity to prevent collapse under high load. It can be used in conjunction with the standard factory air box or any aftermarket induction kit that mounts to the standard air box position. Internal diameter: 95mm