there are tons of things you can do...
i assume you have a .15FE with no modifications to anything else.
to start here are a few things you can do.
-MIP racing clutch (great upgrade over stock)
-new engine (if you have the .15FE this is a must)
-HPI stainless steel hinge pins
-lunsford titanium turnbuckles
-RPM ball ends
-some different rims and tires if you please (on road tires adds a completely new element
-if you like onroad then get the stiffest front and rear springs (purpe(rear) and blue(front))
-front and rear CVD's
-electrical tape for wheels (great for drifting w/o onroad tires and stiff springs)
-upgraded steering servo (strongly suggest)
-fuel filter (MUST HAVE)
-some upgraded fuel tubing
I have a NMT and I am looking into a new engine, since the .15FE just doesn't count as an engine.
I have all the upgrades above except the new engine and I have loved my NMT
keeping everything well lubed and clean is a must so since it is used I would reccomend cleaning everything up before you start.
if you have any questions feel free to email me or hit me up on the aim.