Radium Engineering Silicone Reducing Coupler, 2.25-2.5in ID, Offset
The 5-ply silicone couplers are fiber reinforced for strength and come in different sizes. Ideal for air intake systems and turbo intercooler piping. Available in black only. Dimensions are inside diameters.
11-0026 is a bolt-on coupler for the Civic Type-R K20C1 Port Injection Kit. It has a 0.86" (22mm) offset.