4-1

SPECIFICATION : 4-1 Race Header

COLOUR : Polished

MATERIAL : 304 Stainless Steel

MODEL YEAR : Civic EG EK EJ B16

4-1 headers are designed so that all 4 exhaust pipes merge into one. In most dyno tests this produces the most top end power since it usually offers the best flow characteristics for the engine at high engine speeds. 4-1 headers usually move …