For those of you who are putting larger turbines in their Reactions, I just purchased the new Dubro 60 & 80oz tanks:
http://shop.dubro.com/p/60-oz-fuel-tank-qty-1-pkg
The overall shape of the 60oz looks like it would fit the Reaction airframe and would give another 20% capacity. I don't have an airframe to check but when I did own one, I managed to squeeze a home brew tank in that was larger and it really made a difference with the Wren Super Sport I had in mine.
PaulD