The thing about the 2013's is they have the same engine, same exhaust, same cat, same plugs, same headers, same intake and same cooling system as a 2012.
Yet the 2013's put out a lot more heat.
It's not just damaging parts because of their location (and the locations did change for some things). It's because the engine itself is producing more heat.
Does it run hotter? No, the cooling system is keeping it at the designated operating temp. But that doesn't mean more heat isn't being created.
Here's an example:
Take a 2012 RT and a 2013 RT who live next door to each other.
Go for a 300 mile ride together on the Interstate at interstate speeds. Doesn't matter the temp outside.
Put into your respective, identical, garages when you get home. Measure the temp inside when you pull in and 1 hour later.
The garage with the 2012 might go up 3 or 4 degrees while the garage with the 2013 goes up 30-40 degrees. No joke. Pull in at 70F and 1 hour later it's 110F in there. On a cool day!
I'll spare you the math that determines how much stored energy is being released by a 2013 vs a 2012 but the BTU's generated by the 2013 are 10 times what comes off the 2012.
Oh it's not the perfect scientific experiment, but what the heck did they do to these to make them so darn hot? It's the same engine, same exhaust, same cat, same plugs, same headers, same intake and same cooling.
Not that this comes to a surprise, but these things run really lean which will increase EGT's dramatically. I'm guessing in their quest for higher fuel efficiency and lower emissions they increased the EGT's with a leaner mix at higher rpms (6000+, the kind you get at constant, prolonged Interstate speeds) which is the root of the problem.
Melting parts are a symptom. Hot gas cap, sizzling fuel, hot crotch, hot left side panel... all just symptoms of the problem. BRP will bandage the ones that are safety hazards quickly, but the rest are just "the way it is". It's pretty unlikely that they'll be fixing the root of the problem with an existing model.
Like the hot foot problems of the past, it'll be up to us to figure out how to live with our 2013's.