With 4.0 inch flange mount on one side and 6 inch bell design on the other. To be used with 6 inch clamp on filter. Designed for big cubic inch engines or suck through turbo. The DBX™ is not just another factory single or dual mass air sensor put into a larger housing and calibrated. DBX™ is a state of the art multi sensor digital mass air meter with multiple design & functionality patents pending. DBX™ multi sensor design allows the DBX™ mass air meters to be installed in any configuration to the throttle body at any clock rotation with little to no signal deterioration. DBX's™ proprietary Digital Response Filter (DRF) can filter noise, yet allows quick response to rapid air flow changes in one direction. DBX's™ DRF filters out camshaft intake reversion and/or pressure surge (from turbo's or superchargers). This feature allows the DBX™ mass air meters to be used in a suck-through application or a blow-through design such as a turbo or Procharger® application with the same DBX™ mass air meters. DBX's™ digital design allows the consumer to choose from up to 10 different mass air calibrations by the turn of a switch. In addition, these calibrations can be changed easily with our free software by plugging into the USB port. The DBX™ is fully programmable so that make, year, and model applications are simply handled by wire harness plug design. This makes the DBX™ mass air meter's applications virtually endless. Abaco™ now has harness plugs for Mustang, Camaro and Corvette with more coming soon for the most popular domestic and import models.