Synchrotech Carbon Synchro Rebuild Kit Civic Si 99-00 Integra GSR Type-R 94-01. Fitting: Y80 S80 S4C S21 Y21 (B16/B18C) Included: 1-5 Pro-Series Carbon Lined Synchros, 1-5 synchro springs, brass reverse synchro and spring, 5 shaft bearings, bearing clip, 2 axle seals, input seal, shift rod seal, and a new dust boot. Please message us for a Return Authorization Number before sending anything back to avoid processing delays. Real Street Performance is unlike most "Race Shops". We are a fully functioning wholesale and retail distribution warehouse in addition to a dyno-equipped tuning and engine building facility. Our sales center and order fulfillment center operates with state of the art, industry leading software that allows us to get you ALL of the parts you need for your build quickly and correctly the first time without the headaches or excuses. Sign up to our Newsletter.