I just ordered the Siro 3.0 .18 motor from tower yesterday along with the sirio tuned pipe. They are on backorder, once I get it in a couple weeks, I will post a thread with the results. I have read from others that have installed them, they have been very impressed.

I run a nitro rustler with the 2.5 and it runs perfect. I find that my 2.5 in the t-maxx has a tendancy to overheat, or it runs too rich. I think the weight of the truck is too much for the motor and the way I run it, causes the overheating & such. I think the motor is fine, so once I install the .18, I am going to put the 2.5 from the maxx in the rustler and see if it runs ok in it. At this point, I am convinced the motor is fine, it just has to do with cooling, truck weight, pushing the motor too hard, etc. And yes, I have the windows cut out, and have replaced the stock air filter with the motor saver 360 air filter.