I had the dealer put on the OEM aluminum crossover pipes when I bought my 2015 LR4. Land Rover makes them now and they should last the lifetime of the vehicle. I have seen some really bad quality aftermarket ones.

 

Turns out it was none of the crossover pipes or any cooling pipes or hoses.

Oil cooler gasket went out. Coolant leaked all into the valley from the oil cooler gasket failing.

Changing all the crossovers and other cooling components anyway.

Land Rover tech told me to replace the oil cooler too because it gets warped.

 

+1 for the OEM aluminum crossover pipes. I think any reputable shop would recommend them in lieu of the plastic crap which is destined to fail!