Was a long time ago (7-8 years) and I wasn't that great then. The 2.5 and 3.3 run the same carb, so if it worked on the 3.3, it should work on the 2.5. I think part of my issue was that I expected more out of the t-maxx in stock form. The ol 2.5 just should have never found it's way to a MT IMHO. The 3.3 didn't exist then and it's a much better match for the t-maxx/revo.