You have a K24 in your 8th Gen Civic SI? This is the BEST HEADER you need!
PLM Private Label Mfg K-Series Civic FG FD FA Tri-Y V2 (Version 2) ( K24 ) header features a true step-up exhaust header design.The Tri-Y header delivers low to mid end power while utilizing an one piece design which maximizes the engine compartment space.
Includes the bolt-on test pipe, gaskets & all necessary hardware.
Fitment:
2006 - 2001 Civic SI Direct fit with K24 engines 8th Gen Eighth Generation Honda Civic with K24 engines