PRO version - Optional Parts Added: 
X3S-13 - 7075 Rear Brace Holder
X3S-14 - 7075 Rear Up-Right
X3S-16 - Screw Type Rear Hub Carrier Shaft
X3S-20 - 7075 Front C Hub 12° 
X3S-21 - Alum Rear Skid Plate
X3S-22 - CNC Machined Alum Pinion Gear Holder
X3S-24 - 7075 Front Upper Plate
X3S-26 - Brake Pad Push Away Springs

Features:
Lightweight front, rear & center differentials
Complete set of lighteweight outdrives
7075 front & rear shock towers
Full travel front & rear suspensionz
Re-designed steering system with ackerman
22° Steering front hubs
7075 Drag Link
Solid constructed arms & camber links
Steel captured hinge pins
7075 arm holder & toe plate
7075 front & rear chassis braces
3mm 7075 lightened chassis with countersunk screws
Front & rear chassis kick up
Version 2 bnig bore shocks
Counter-clockwise shock screws x 2
Full lightweight CVA drivetrain
Adjustable turnbuckles & lightened camber links
Complete rubber seal high performance ball bearing set
Composite stone guards & rear mud guards
High impact down force wing
Lightweight inch up wheels & tires
Front & rear sway bars
CNC clamp lock motor mounting system
Composite 46T spur gear. M1
Soft compound racing tires
Composite battery tray with ESC plateform
Composite servo mount & sealed receiver box
Carbon graphite center diff X plate
New clear low CG cab forward body
Steel internal spider diff gears