It depends on what surface you are going to be racing on,for carpet or dry astro I would say not to cut, but if it is grass or low grip surface then you cut the top deck that runs from the slipper to the diff down the centre to give more flex, I haven't cut mi e but if you look at some photos of cars on here you will see some cut.With the pistons I have drilled 2 of the 6 holes out to 1.3 mm as new the holes are only .95 mm I think and if you start small you can always drill larger if you think you need to.
Anyway with both of these mods you can replace the parts if it dose t work for you.
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