can someone tell me if there is a way that i can piggyback to air compressors? i have one that produces 6.4 cfm @90 psi and a pancake compressor that produces 2.6 cfm @ 90 psi. i know that manifolds are available and i was thinking of plumbing that, but i am worried about one compressor overpowering the other and forcing air back into to it. any ideas????????