That tire will make your new tire .1% slower than the stock size, which won't even register on your speedo. You can see how much smaller of a sidewall your going to have to run in order to keep everything the same. Any bigger and you will throw your speedo off.
To go about 3" bigger on the diameter means that when your speedo is reading 60mph, your actually traveling 66.3mph or 10.5% to slow