That's about 4 meters extra tubing... + the tubing in your cooler case + additional tubing to get outside of the case.
Roughly speaking 5 meters of extra tubing...
Will an Iwaki MD-15RLT handle :shrug: ? Once you get the air out, You might have some waterflow left, and as you are using a pelt it might be enough.
I guess you need to use pelts to overcome the low waterflow
But then again, low flow systems with 6.5 mm tubing and a 300l pump work also quite good (koolance, the innovatek "german" systems, etc) but they don't do wonders.
Aslong as you won't OC your GPU, it might just be enough but don't expect wonders when you want to OC your GPU!