I've had my share of cooling problems and have never legally been able to address the issues myself until recent.
the stock coolant crossover pipes split and were replaced with the revised connectors about a year ago.

recently I have seen an aluminum kit v3 available from Euro AMP that looks brilliant including
Aluminum Thermostat
Aluminum Coolant Crossover Pipes
Aluminum Heater Manifold Pipe
Aluminum Oil Cooler Inlet Tube

and a bit more. I am after the communities perspective on this kit and if there are any short falls with it. Now that I am the car rightful owner and have had a look at the previous work done on the engine bay I'm shocked at the missing clips on the front air intake spouts the red sealant goo around every hose connection with the throttle body included and the visible hammer job performed to reconnect it back to the air tube leading to the air boxes.

I will be basing and re-reading the work done by DeviLSh when replacing the connections

 

Other threads will show that the updates to metal are a no brainer. Definitely worth the investment

 

It's a pretty complete kit.
Now do watch out as that has the thermostat with the sensor. The V-6 did come with both setups depending on the car.
Does your car have that? I first thought that was some kind of temperature sensor but it's more than that as it is attached to the tip of the thermostat inside the housing.
I don't "think" you do because you have a 2015 but not sure?
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*Update, cooling kit arrives Thursday. Along with DeviLSh sticky post I have also been watching Den-Tech-Mods over on YT.