I'm putting a 1999 A4 Quatro 1.8T back together and I don't have anything to bolt to the Secondary Air Injection Check Valve on the back of the head. It looks like it is supposed to go to the exhast and the secondary pump. and it also has a nipple for a small vacuum hose. How do I know if my car is equipped with this stuff? I don't see a hose leaving the air box for this nor do I see where it would go in the exhaust. and I don't have any vacuum hoses hanging.