With capablities far larger than most A/F Meters on the market, Big Stuff3's BigLog will allow you to maximize your combination in short order. With built in features far superior than the competition, this is a must have for everyone that wants to tune their car themselves.

FAST™, the recognized leader in EFI technology, has developed an easy to use Dual Sensor Air/Fuel Meter that delivers the complete story about your engine’s tuning. Tuners now have the power to read two wide-band O2 sensors individually or average them together for super accurate readings of the engine’s true air/fuel ratio.