Modifiy the TRX pro .15

[Matt15]

What can you do to modify the TRX pro .15 to make it faster and more powerful.

[Tazz R/C owner]

The most important things are to tune the engine correctly and tune the clutch properly.
http://www.rccaraction.com/rn/articles/super_tune.asp
http://www.nitrorc.com/articles/clutch.html

If you feel you have your engine tuned great, you may want to port it. I suggest not grinding on the con-rod, and replacing the bearings with either ACER Racing or Boca bearings (you will need two 9x17x5mm bearings). Also, do not do this unless you are very skilled with a Dremel or another rotary tool; one slip may cost you $40.
http://www.nitrorc.com/mods/engines/trx15mod.html