Thanks guys, I do have the new 4 x 1.8 pistons coming in,
Are the 6 x 1.6 pistons your talking about the old style?
Yes. Tekno's pistons, up until the new flat/tapered 4 x 1.8's have that "cupped" shape to them. From the black, plastic 10 x 1.2's found on the shock parts tree (from the kits), to the white delrin machined versions. They all have had that "cupped" shape (or bowl-like shape).