2015 can am outlander 1000xt with yoshimura slip on

Hey I’ve got a question. I just bought a new can am outlander a few weeks ago and I had issues from the very start with my factory exhaust getting to hot to the point it started melting my back fender. Long story short the dealer had it for a few weeks trying to figure out the problem and they wound up just putting on a yoshimura slip on for free to see if that would fix the problem and it didn’t so I told them I think it’s running to lean and that a tuner may fix the problem and they’re going to get me one for free but asked me which one I prefer so my question is what’s the best tuner to get for it. It’s stock except for the exhaust. Thx for any help