We just purchased a 1968 912. The owner’s manual shows the Exhaust Emission Control System and the Annex to Drivers Manual that the car should have lines from the Exhaust Port input, Check and Relief valve and Air Pump. None of these are there. Is it possible this car did not come with this set-up? And if it did come with these parts, how or can we replace? Difficult? The car was bought off the dealer lot in Texas originally.