you can go any size you want as long as it fits in your wheel well; however, usually, up to 2 inches up from stock size will create no problems..you won't notice too big a visual difference with 16" rims so I suggest you check how a 17" rim would look....i'm sure you'll like 17" better..the advantage is you MIGHT have better handling/stability and the car will look nice...the negative is a slight drop in fuel economy and acceleration due to the increased weight of a larger wheel/tire combo...also, you need to get an alignment after the change, due to altered suspension geometry; you don't need any police paperwork for this...best of luck:-)...also, please do not buy cheap tires; at the very least, you can buy Kumho Solus KH17 but please no Chinese tires. The handling you gain from bigger wheels will be immediately lost with your cheap Ling Long or Wanli tires.