Performance wise, it was ok - read on. What it did for me was make my Z A LOT smoother. With that smootherness, it makes it feel quicker. I didnt have the exactly perfect running Z before the chip. My friend bought a great condition na z which made my car feel like a Old about-to-die mustang compared to his finely tuned beast. After i put in this chip, I enjoyed riding the Z more then ever. MPG also looked like they increased (havent ran a full tank though it yet). I will be posting a long review about this chip and my long overdo Labree review later on. I recommanded it, best mod i have done to my z yet.