Steve from Maltech has kindly supplied this info on the clutch lines:
"The only reason that l can see for the extra line and junction block is to give the clutch pedal a softer feel. Nissan is the only manufacturer that l have ever seen this set up on.
The master to slave clutch hose may make the clutch pedal slightly firmer to push, but we just fitted this type of hose to a GTR that had an extra heavy duty clutch fitted and you could hardly notice a difference in the pressure required to push the pedal.
The master to slave clutch hose will not affect the operation of the slave cylinder in a negative way.
Response from customers is nothing but positive, first point is that the hose was easy to fit, clutch bleed up straight away, and they now have a much more positive feeling clutch pedal, you can actually feel the point that the clutch is engaging at, and this point is exactly the same every time.
Clutch hoses are not required to meet any ADR standard, but having said that the master to slave clutch hose we produce does comply to ADR as it uses exactly the same hose, inserts and fitting type as the brake hoses.
This hose is also tested to 3500psi
Regards
Steve
Maltech"
I hope this helps