RE: fantom .18?
I haven't had mine too long yet to tell you to much about how everything will hold up but, I'm sure that you will have to do some upgrading. The rear axles on mine are starting to twist and that was before I put in the Fantom. There is a noticeable difference in power and top speed. As far as tuning goes, night and day difference between the 2.5 and the Fantom, I had some good luck with my 2.5 but had the normal problems of over heating and stalling. The Fantom does run hot but that is the way they designed it. It also seems to hold a tune well, I think on day I ran 5 to 6 tanks through it and only tuned once. So far I the Fantom has been great, I only wish that I would have changed to is sooner!