The stock 16s are pretty much stuck with the stock size.
If you go wider, the tire height drops, making your final gear ratio increase.
This makes your engine work a little harder, but most importantly, throws off your speedometer.
Not a good thing when the state police officer is riding your @ss waiting for you to make a mistake.
Been there...
Just upgrade to a larger rim diameter, and you can select a wider tire with the same overall diameter as the stock tire.
You won't need a tuner to change the computer to register a different tire height.
SOHC