409 Series Header - 8th Gen Civic Header (06-11 Civic Si) - K20 OnlyApplications: 06 11 Civic SI Coupe and Sedan Features: * Fits Civic Si with K20Z3 engine. * 4 2 1 Tri Y Design 409 Series Steel * CNC cut 3 8" thick flanges * 2. 5" Outlet Note: *It is highly recommended to upgrade your rear engine mount to a Hasport rear mount to limit movement.*Donut gasket can be replaced by OEM Honda part (18229 PCX 003), you will have to reuse the metal ring. The K Tuned 8th Gen Civic SI Header was specifically designed to
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409 Series Header - 8th Gen Civic Header (06-11 Civic Si) - K20 Only