I know the reason why owners decrease MTOW but you must be careful with payload, pax, fuel according to ramp check so my company wants to increase MTOW. I know about eurocontrol and landing fees.
I heard, kit from piper company costs from 2500$ - 5000$, it is probably something like STC, but this kit increase MTOW isn't true? I also heard about changing AFM from other aircraft of course it must be the same type - piper Seneca V, but nobody confirm this solution. Maybe you know something about it?