The line in question is the one that sits under the intake on the drivers side. Its right by the hole you had to enlarge to make the intake fit.
Pictures:
I will pass on this info to Stillen, maybe they can include a small rubber C-molding for the AC line.
Does anyone know if we can just weld these lines shut? Maybe some plumbers putty?? Its a tiny tiny hole and I think it can be fixed without replacing anything.