I need help.

A metal conduit will be used as a pathway for wiring through a concrete block. The conduit is a 6 foot long rod with an outer diameter of 3 inches and an inner diameter of 2.8 inches. What is the volume of metal in the conduit in cubic centimeters?

So far i converted everything to inches.
and did this

3-2.8 = .2

(.2)^2 * (6*12) * pi = 9.047786842in^3
9.047786842 * 2.54^3 = 148.2666cm^3

Where did I go wrong?

Question

I need help.

A metal conduit will be used as a pathway for wiring through a concrete block. The conduit is a 6 foot long rod with an outer diameter of 3 inches and an inner diameter of 2.8 inches. What is the volume of metal in the conduit in cubic centimeters? 

So far i converted everything to inches. 
and did this

3-2.8 = .2

(.2)^2 * (6*12) * pi = 9.047786842in^3
9.047786842 * 2.54^3 = 148.2666cm^3

Where did I go wrong?