PLM K-Series K24 K20 FG Header V2 with Bolt-On Catalytic Converter Shifters & Parts and it accommodates the factory

and it accommodates the factory mass air sensor and a replacement silicone crankcase vent hose

(1) Neoprene firewall seal

(4) pistons

Aggressive torque

10th Gen Honda Civic Si

PLM K-Series K24 K20 FG Header V2 with Bolt-On Catalytic Converter Shifters & Parts and it accommodates the factoryFITS: 8th Gen Honda Civic Si You have a K24 or K20 in your 8th Gen Civic SI? This is the BEST HEADER you need! Features: Stainless steel construction Metallic core 200 cell high flow catalytic converter Direct bolt on installation One year warranty Short tube Tri Y header True 2. 5" collector CNC machined manifold flange 3 8" thick flanges 18 gauge stainless steel One piece design Includes donut gasket & hardware