Back in 2003 the HyTech header and exhaust were custom made and very hard to get. I found the header from one seller and the header back from another. HyTech exhausts for the Intgra are 2.5" diameter and was the perfect upgrade from an ITR 2.25" dia.
HyTech has been the leader in race engine exhaust technology for the past 30 years, with numerous championships in every type of racing. HyTech's innovative approach to exhaust development has catapulted it into the forefront of the racing and aftermarket industry. HyTech Website