JMS 1998-2002 Chevrolet Camaro Pontiac Firebird 2004 Pontiac GTO 1997-2004 Chevrolet Corvette Digital Mass Air Modifier LS1 Uses LS3 Sensor 4001GM4 | AutoPartsToys


  • FILTER your Mass Air Signal Cleans up a noisy Mass Air Signal Sixteen different filter settings.
  • Adjustable FILTER window: Idle or cruise.
  • SCALE your Mass Air Signal Fine tune for additional power or extend range to eliminate "pegging".
  • Learns the unique idle Of each vehicle.
  • NO need for a laptop, all adjustments can be made With the included screwdriver.
  • Easy to setup and use.

The Jms Mass Air Mod'fier Is The Only Product That Can Both Filter And Scale Your Mass Air Signal. A Clean, Filtered Mass Air Signal Will Improve The Way Your Vehicle Operates At Idle And Cruise. Adjust The Scale Of Your Mass Air Signal, Extend Sensor Range And Eliminate Pegging.


  • Plug and Play Wiring harness
  • Connects to your existing mass-airflow sensor Via included installation kit
  • FILTER and clean up a noisy MAF Signal
  • SCALE your Mass Air Signal for additional power or Extend sensor range and eliminate pegging.

Silver Aluminum Case with four mounting tabs.

  • LENGTH: 33/4"
  • WIDTH: 2 1/2"
  • HEIGHT: 23/8"

The JMS Mass Air Modifier has been designed to accurately Scale and Filter a MAF signal. All adjustments can be made live "on the fly". Once configured the MAF signal is shifted and filtered whenever the unit is"ON". The Mass Air Modifier is "ON" whenever the ignition key is in the "ON" position (Green power LED is ON). Configuration is simple, there is no need for a laptop, all you need is the enclosed screwdriver.

  • 9.5V 20V DC


  • Compatible with all 12V or 16V battery systems
  • pn: 4001-Digital Mass Air Sensor (HZ)
  • pn: 4002-Analog Mass Air Sensor (0-5 Volts)
  • Works with all Stock or Aftermarket Recalibrated Mass Air Sensors

Plug and Play OEM Style MAF Input/Output connectors:

  • Plugs the Mass Air Modifier in between the MAF Sensor and vehicle harness.
  • Six Pin Connector: Plugs harness into the Mass Air Modifier Unit
  • White Wire: Selects Filter Window, Either Connect to Ground
  • (Filter Window Input = MAF Signal) OR Connect to 0-5v DC Sensor
  • Output:(Electronic Throttle Body, PPS, TPS or other external sensor)
  • Yellow Wire:lf Grounded the Filter Will be Manually Disabled


  • JMS Mass Air Modifier part number 4001 or 4002
  • Plug and Play Brand Specific Wire Harness (Ford/GM)
  • Installation parts package


  • Ring terminals, Wire tap, self tapping screws, tie straps & screwdriver

Brand: JMS
UPC: 021201225221

  • 1998-2002 Chevrolet Camaro
  • 1998-2002 Pontiac Firebird
  • 2004 Pontiac GTO
  • 1997-2004 Chevrolet Corvette



Added to cart successfully!