Yes but need to find right offset so the tyre will not hit fender.

PS4 with wider tyre cornering gooding yoo  

Anyway how much PS4 per donut? 

Yes you can use 205/50/16 with stock rims but it will look like donut

Here guide for understanding wheel size

Example Wheel Size: 16x7 4-100 40S

16
Wheel Diameter: The size of the wheel as measured across its center.

7
Wheel Width: The width of the wheel as measured across its barrel from the front rim to the rear rim.

4-100
Bolt Pattern: The bolt pattern indicates the arrangement of lug holes and consists of two elements: the number of bolts, or lugs (4 in this case), and the distance between them across the center of the wheel (100mm in our example). For more detailed information, visit our Bolt Pattern page.

40
Offset: The offset of a wheel is what locates the tire and wheel assembly in relation to the suspension. More specifically, it is the measured distance between the hub mounting surface and the centerline of the rim. Our Info Center has more information in the Wheel Offset page.

S
Finish: With hundreds of different wheels there are dozens of different wheel finishes. They are clearly marked at the end of the wheel size (ex. S = silver).

http://www.discounttire.com/dtcs/infoWheelSize.do

About 6" i believe its about width is your rims
More increase the width, more wider the tyre 

Correct me if im wrong sifu 

CVT also got gears? SC nowadays bullshit non stop.