Hit up some die-hard forums for your car usually those guys know everything about the maximum sizes you can stick in there, and what work needs to be done as far as rolling fenders, etc, to get slightly larger sizes in there as well.
If your not going to jack up your car you want to keep the stock tire size. It will not only cause problems with speedo but engine and tranny problems also. The place where you get your rims (if that is what you are planning to do) should the new tire size to the stock tire size.
You can go as wide as you want but keep in the mind the wider you go the more road drift you will get. This is also the same for the size of the rim. Bigger = more drift
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