You have a K24 or K20 in your 8th Gen Civic SI? This is the BEST HEADER you need!
PLM Private Label Mfg. K-Series 06 - 11 Civic Si K24 K20 header features a true step-up exhaust header design. This version 2 (V2) is a one-piece design for 100% leak free installation.
Fitment:
2006 - 2011 Civic SI
FG FD FA Chassis
Direct fitment with K24 engines
Direct fitment with K20 engines
8th Gen Generation Honda Civic Si
Key Features:
Made of stainless steel
One year limited 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
Does not include header gasket. Please use the factory gasket.