904 Accumulator Spring

I would also refer to Carl Munro's book. From stock to performance use he says to put the spring back in. It is only in the full Drag race box that he talks briefly about blocking the piston.Basically he only refers to it effecting the 1-2 shift, nothing else. I would think with the upgraded frictions ,better band material, reworked valvebody and higher line pressures, this mod would be indiscernible.