Art,
The valve covers are redone to pick up the oil vapors from the center upper portion of the valve covers because most of the original problem when on track comes from braking and acceleration which pushes the oil trapped from high RPM in the upper part of the engine straight into the PCV system. By changing the location you eliminate this surge of oil and deal with actual vapor rather then a flood of fluid.
You can use another system that attach's to the regular openings in the valve covers, but it will not be as efficient or effective as the system SRT has gone with. I should have the SRT system ready to go in a couple weeks. They have been slow at getting the lines and hardware packaged for shipping, they have also not come to a decision on the pricing. I have been trying to insure that the price is in line with some of the other options (other than the valve cover mods) so we'll see soon if that is helping.