When the WEP runs out,(when engine cools off you get it back) N becomes a D40 with a thousand or so extra pounds. That being said, it's the only plane I've flown for 5 years or so....it's capable enough...with a really good pilot, it's a monster. Like all planes, it has to stay in what it can do best. M is tons better plane, (evidenced by stats...N has a kill ratio of .67 or so camp after camp) but I cant stand it, has little rudder effect, little elevator effect, compared to N