Getting window tints for sure, not sure what percent tint will be best. I think I will starts seriously looking into this after I finalize my decision on interior color, as it might change how dark the interior appears to be with tints.
Was debating on getting vent visors, it might make the RLX look bad but we'll see when they become available.
For a high luxury sedan like the RLX i can't see too many modifications as there is not too much support from the aftermarket. And that has been the same from the past. People that buy the RL or aka RLX now just simply look for class and yes, status. Other than that most won't even know what the RLX is capable of.
Performance mods for the RLX will be overlooked, if anything cosmetics would be the closest mods like tints and exterior add ons. The interior is not missing anything crucial so nothing will be needed there.