Well im gonna assume you have herd of chipping your car using products such as Diablo tunner, SuperChips, then there is replacement computers from companys such as vectormotorsports and other. The purpose of this is to change multipul setting within the factory computer to increase power. Basically a performance mod. A dyno tune is a custom tune for you car. Kinda like buying a tailored suit vs. buying one at walmrt. Which would u rather have? Thats up to you. However i found a dyno tune to be cheaper and did as good, or better than other tuned/chip/ options.