I am buying a C&L 73mm MAF and it comes with an air filter. I am also buying a MAC cold air induction system, which also comes with an air filter. So which one do I use?
Buy a Pro-M meter. The C&L 76MM is miles better then the 73MM if you must have one. In fact the 94-95 C&L 76 MM kit comes with a power pipe, filter and sheild for around $250 total. So there is no need to purchase a MAC cold air kit. Striped5.0 and 2L8 have these with great success. Still love the Pro-M meters though.
Use the filter that comes with the C&L because it is a K&N. Don't waste your time with the 73mm unit, they are more of a design for the Foxes. I have been running the 76mm with the K&N and 'power pipe' for about 2 years and have nothing but good stuff to say about it. It gives the car some more top end pull.