seriously though it's awesome. Lightning fast with great torque for a mini. Feels like a high end 1/10th scale jr in a mini.

Oh definitely... I might be up grading soon!

Just gonna have to paint the case black

I have an RC18B, too, but I'm pretty new to all this. If I bought the Hitec HS-5065MG Digital Micro BB MG Universal Servo would I need anything else to make it work?

Nope! Don't need anything extra!

Just make sure to adjust your EPA properly, if you can... Digital servos are apparently more likely to cook when the EPA's aren't set right.

I'm told in another thread that I would need an Associated adapter, too. Is that true? Also, what EPA and how do I adjust it?

You shouldn't need an adapter...

Depending on what brand you buy, you might have to trim a tab off the plug, but other than that, no worries...

EPA is your end point adjustment... It adjusts how far your servo can turn.

If you're using the stock XP2 radio, that little dial beside where your thumb sits, under the steering wheel, and behind the throttle controls how far your steering moves... Dial it back to take steering out.

Got it. Thanks.

No problem!
Hope it works out for you!