You're in the right forum. It's a Revo.
I've done the conversion in a Savage, complete with the conversion frame and TVPs from Fast Lane Machine.
Quark 125B Monster Pro
Features: Monster Pro 125 Ni-MH 5-18 cell Lithium 2-6 cell
125amps (@Full throttle, 25deg C 300amps (@10 Seconds)
38KHz 0.00036ohms Realistic ABS (Proportional) Adjustable
Automatic/Adjustable 110 - 120 deg C Yes/Adjustable Automatic Fail-Safe
On/Off Single Button/4 Colored LED 5V/5A
(Input 8.4V,Peak 8A) 70 x 34 x 19 mm 78 grams (w/o wires)
3 New Reverse Options 4 Torques Selections 5 Braking Selections
9 Drag Brake Selections Can Handle 18 Ni-MH / 6 Li-Po Cells
Super-Low 0.00036ohms Quark's Zero-Cogging Effect
Price $279.95
The cost adds up quickly, but the power and speed should be intense.