Borla 2023 Integra/22-23 Civic Si 1.5L 4 CYL. MT FWD 4DR 2.50in S-Type Catback Exhaust Carbon FiberBorla 2023 Integra 22 23 Civic Si 1. 5L 4 CYL. MT FWD 4DR 2. 50in S Type Catback Exhaust Carbon Fiber This BORLA(r) Cat Back(tm) system for the Acura Integra and Civic Si is designed specifically for these vehicles. The system features BORLA(r)'s Polyphonic Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full bodied sound