Bigger pipes are an extension of your tank size. Years ago, a friend installed 3" circumference piping in his pole building with 1" drops. I don't remember the exact number, but it added more than 10 gallons to his air capacity. The downside was that it took the compressor longer to build pressure to its shutoff point. I looked into doing something similar, but the I felt the cost involved was past the "diminishing returns" standpoint. I went with the bigger compressor instead.