Yonaka Motorsports headers for all B-Series DOHC VTEC motors featuring 1 5/8" pipes with 2.5" collector flange. This is an aftermarket header, designed from the JDM 1998+ Integra Type R B18C engine. With the larger pipes and the larger 2.5" collector, it will immediately add horsepower. Totally redesigned to improve fitness and flow. This header is fully polished stainless steel.