SpecificationBlow Off Valve: Holds Up to 30PSI Boost Pressure Easy Assembly,Aluminum Flange, CNC Machined Billet Aluminum Body Dual Spring System Promoted Response & Allows for High Boost Pressures Hard-Anodized Valve for Increased Air Flow Powder-Coated Anodized and Polished Finish 2 Bolts Mounting Design Flange Pipe Adapter: 2.50\" (63mm) Pipe Size Fits Type-S or Type-RS Dump Pipe Flange Oval / 2 Bolt Flange Design type Condition: 100% Brand New Warranty: one year warranty for any manufacturing defect Package Includes: 1x Type-RS Blow Off Valve Kit 1x Type-RS 2.5\" Aluminum Flange Pipe Adapter (You will get exactly as shown in the picture above)NoteProfessional installation is highly recommended (No Instruction Included) For any needs please contact us.