I don't think theres any point to NOS when it comes to mud, unless you don't have enough power to spin your tires. Every time I've gotten stuck in mud is because I don't have enough traction, or I am dragging, or I just landed in a puddle on my frame with my wheels off the ground. Never have I not had enough power, I just havn't had the traction. Same reason I don't understand going in 4lo to go through mud, its not going to get you any more traction, just more torque to the wheels. I'd put the NOS money into a locker.