ASP Headers Civic Si 06-11 Custom Under Car Exit Header for the FG2 chassis using the K20 or K24 block. Individually designed to match each client's motor specs. Design includes duel diameter runners which allow the lengths to be adjusted for optimum efficiency and full hp:tq potential.The megaphone option is used to maintain the best mid range power. Made in USA.
Options: For 2.5 inch after cat location exhaust hook up. We include a 2.5 inch 304 stainless steel test pipe, one o2 bung and a standard 2.5 inch 3 bolt exhaust flange.
For 2.5 inch Full Race Exhaust hook up. We include a 2.5 inch 304 stainless steel test pipe, one o2 bung and a standard 2.5 inch 3 bolt exhaust flange.
For 3 inch exhaust hook up after cat location. We include a 3 inch megaphone, reverse cone, o2 bung, and 3 inch v-band assembly. All 3 inch exhausts will require a portion of the v-band provided to be welded to the clients exhaust.
Includes: Material in US grade 304 stainless steel. Machined K series head flange. Mandrel bent equal length primary & secondary runners. 4 beehive collector springs, 8 spring tabs. 1 compact true 4-1 merge collector. One o2 bung, and which ever exhaust side option you choose.
Restrictions: O2 sensor extension required. Off road use only.