Balanced pulse exhaust extraction is possible on this system as identical volume chambers are created by equal length tubes. Precision jig assembly of the mandrel formed components assures ease of fitting to Type 2 and 25 models models from 1972-83 with a 1700cc to 2000cc engine fitted. + 1900cc WBX upto 1985. This exhaust will also fit a T25 with a type4 engine and a T25 with a waterboxer engine up to 1985 but may need modification to the rear panel