You will find the Leopard to be a much better choice, especially for a Mono... the Feigao motor is only a 2-pole, vs. 4-pole for the Leapard. If you read the specs, you'll see the Leapard is rated for more watts, etc.
Feigao 7XL:
Motor Specs:
6-24 NiMh or 2s to 6s Lipo cells in a medium to large sized mono or hydro.
1000 Watts Maximum with proper cooling.
35.8mm dia x 75mm long
5mm Output Shaft. Use 5mm Couplers.
372 grams
Up to 1000 watts of power with proper cooling.
50,000 rpm bearings!
Aluminum Purple Anodized Casing
2-Pole Neo Magnets & Compressed Windings.
Mounting screw holes are 25mm apart on center.
3mm mounting screws.
Leopard 4074
Specs:
Magnets: neodymium
Watts: 1500 with Over 2000 Burst.
Poles: 4
Motor Shaft: 5mm with flat spot
Can Measures: 40mm diameter x 74mm long
Weight: 375 Grams
Mounting screw diameter required: 3mm
Mounting Holes 25mm apart for use with most 540 mounts.