There is no definitive answer to this question as it depends on a number of factors, such as the make and model of your vehicle, your driving habits, and the terrain you typically drive on. However, most experts agree that a 2-inch lift is generally sufficient for 33-inch tires. Keep in mind that you may need to make some adjustments to your suspension system if you're planning on running larger tires, such as increasing the spring rate or adding air shocks. You should also be aware that running larger tires can adversely affect your fuel economy.