Does anyone know if the '65 911 was ever offered with a dual exhaust? My car, originally sold in Italy and brought to the US some years later has exhaust cutouts in both rear bumpers. They appear to be original to the car, and both cutouts look factory or else someone did a really good job creating one. The current muffler exhaust is on the left side. There is no mention of any modified exhaust in the Kardex or COA.