Thunder Tiger engines, rock. I have a .40 Pro and it screams. It seems that it really woke up after a few gallons of fuel in it as well. I put it on my Ultra Sport .40 with the intention of replacing it with a OS .55AX. But it pulls the US around so well, that I still have the .55 sitting in a box. Do I have unlimited vertical? Nope, but plenty enough power for what I want to do. It'll be great on your trainer and serve you a long long time after that.

Good choice on the .46 Pro.