I run a 25 with the fioroni turbo twin on a Losi 8t, even with two hard springs it comes in a little early, the turbo slider (2 pieces) will allow you too run three springs instead of two and works much better. However, be prepared to change the springs about ounce a gallon or so.
If your using the GO colet, you will have to shorten it as it protrudes through the flywheel.