The new Ritech headers have been designed to fit to the existing twin downpipes and the rest of the standard system - or to the Ritech X pipe. made in Stainless Steel the induividual pipes merge into a collector with spike to ease gas flow.  Straight fitment will yield 10BHP and 10 ft Lb of torque. With special LH and EZK custom matching ECU chips 23-25 BHP and 30ft Lb of torque can be expected. Sold as a pair it is a shame they are not very visible once installed.