Finally an original replacement for the stock Opel GT rear resonator. These new resonators have the internal baffle design to create the correct exhaust note as when the car rolled off the showroom floor in the 1970's. These parts have not been available in the past 40 years. We are happy to bring back the correct exhaust resonator to keep the exhaust sound pure. Also see mounting bracket 10021OE, 10008, 10006, 10017,10005, 10004, 10009, 10011, 10018 and 10022 to complete the exhaust system