SPDZ1 K Series Header Downpipe 12-15 Civic Si & 13-15 Acura ILX Stainless BellmouthSPDZ1 K Series Header Downpipe 20122015 Honda Civic Si 20132015 Acura ILX K24 (9th Gen) Unleash the full potential of your K24 with the SPDZ1 K Series Header Downpipe, engineered for maximum flow, durability, and performance. Designed for 9th Gen Civic Si and Acura ILX models, this header downpipe eliminates factory restrictions to deliver serious horsepower and torque gains, faster turbo response, and a more aggressive exhaust note. Crafted from 304