Are you changing out your header for a performance aftermarket or type-r header? Do it right the first time and avoid any nasty exhaust leaks with the Blox Racing 2.5 JDM-spec sized collector donut. This collector gasket is for use only with headers with a 2.5" collector outlet.
Blox 2.5" JDM Collector Gasket - Honda / Acura
Cancer & Reproductive Harm