For modified and custom tuned applications where the stock mass air meter "pegs" due to increased air flow. This 90mm MAF meter is a direct bolt in replacement for 00-04 Lightning and 03-04 Cobra, or can be plumbed to any veh with our CNC MAF adapter flange. The calibration of this meter is OEM quality to ensure factory driveability, repeated accuracy, and reliability. Custom tuning is required for best results. Supports 400rwhp - 625rwhp with Centrifical Blower Applications, 400rwhp - 700rwhp with Roots Blower Applications