How do you mean that?
If you intend to get a CLC cooler (so a Corsair Hydro series cooler or something like it), they are not intended to be modified. Changing the tubing would void its warranty (not the CPU's though) and I would not recommend you do it anyway for other reasons. Most I would do is get some custom water tubing, cut down its length and just wrap the tubing with that if you want to change its aesthetic.