Stage 3 Adaptive OBD2 Performance Chip for Mercury - Plug-In Module (+40 HP / +45 TQ)
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- Guaranteed Fitment
- Performance Tested
- Lifetime Warranty
Ships within 24 hours. Most orders arrive in 3-5 days.
Stage 3 Adaptive OBD2 Performance Chip for Mercury
Plug-in performance module for Mercury cars and SUVs with an OBD2 port (1996 and newer). Stage 3 is our strongest setup: up to +40 HP and +45 lb-ft on turbocharged engines. No flashing, no ECU unlock, no app.
- Up to +40 HP / +45 lb-ft on turbocharged engines; naturally aspirated engines gain less.
- Programmed in house for the Mercury year, model and engine you enter below the options.
- 100% safe and reversible. Plugs into your OBD2 port in about a minute; unplug anytime to return to stock.
Rated 4.9/5 by 17 verified buyers | Lifetime warranty | 30-day returns | Ships within 24 hours, most orders arrive in 3-5 days | Assembled in the USA, programmed in house for your vehicle
Fits: 1996 and newer Mercury cars and SUVs with an OBD2 port, including Grand Marquis, Mountaineer, Mariner, Milan, Sable and Marauder. 4, 6 and 8 cylinder engines.
Choosing your engine size and options
Not sure which engine size? Here's a quick guide.
Engine Modifications (If any): Stock Vehicle, Intake, or Intake and Exhaust, to match what's on your vehicle now.
Tuned for: Performance for the full Stage 3 setup; MPG for a smoother, economy-focused setup if you mostly cruise.
Engine Size (common Mercury engines):
- 4 Cylinder: 2.0L / 2.3L / 2.5L (Mystique, Milan, Mariner)
- 6 Cylinder: 3.0L / 3.5L / 4.0L V6
- 8 Cylinder: 4.6L V8 (Grand Marquis, Marauder, Mountaineer)
Then enter your make, model and year in the optional "Enter Make, Model, Year" box. Not sure? Contact us before ordering.
What to expect
- Quicker throttle response. Less of that dead spot when you roll into the pedal from a stop or to pass.
- More midrange pull. Merging, passing, climbing a grade with a load.
- Doesn't change your drive modes. Your factory drive modes stay as Mercury set them up.
- Realistic gains. It's a plug-in module, not a full ECU re-flash. Up to +40 HP / +45 lb-ft on turbocharged engines; non-turbo engines gain less.
How it works
The module plugs into your OBD2 port and works alongside the factory engine computer. It's adaptive: it reads how you're driving, from throttle position to fuel demand, and adjusts its output to match. Easy cruising stays smooth; get on it or tow and it gives you more. Nothing inside the engine computer is rewritten. Each chip is programmed in house for the make, model and year you enter and the options you pick.
Install in about a minute
- Find the OBD2 port under the dash on the driver's side.
- Engine off, connect the module with the included plug-in cable (long enough for any vehicle).
- Turn the ignition on (or press Start) and start the engine. The PWR, LNK and DAT LEDs light up to confirm it's connected. Drive normally for a few trips while the module adapts.
Dealer visit or recall? Unplug it first and your Mercury is stock.
100% safe and warranty friendly
The module works within safe limits for your engine and leaves the factory programming untouched.
- Lifetime warranty on the module.
- 30-day returns. If it's not for you, send it back.
- Ships within 24 hours; most orders arrive in 3-5 days.
- Assembled in the USA and programmed in house for your vehicle.
- In the box: the module (with PWR / LNK / DAT LEDs) and a plug-in OBD2 cable.
- Questions? Contact us and a real person will answer.
Common Questions
Will it fit my Mercury?
If it has an OBD2 port (1996 and newer), yes: Grand Marquis, Mountaineer, Mariner, Milan, Sable and Marauder and more. Pick your Engine Size and enter your make, model and year when you order.
How much power will I actually get?
Up to +40 HP and +45 lb-ft on turbocharged engines. Naturally aspirated engines gain less. You'll feel it most as sharper throttle and stronger midrange.
What does "adaptive" mean?
It watches throttle position and fuel demand and adjusts. Light cruising stays smooth; hard acceleration and towing get the full Stage 3 output.
Not sure which engine size?
Here's a quick guide: the Engine Size list above shows common Mercury engines. Still unsure? Contact us before ordering.
Will the dealer know?
Unplug it before service and your Mercury is completely stock. Nothing stays behind in the engine computer.
Why does the module say JDM PROM?
JDM PROM is the brand name on the module and its retail box. Every unit is programmed in house for your specific Mercury make and model, assembled in the USA, and backed by our lifetime warranty and 30-day return window.
Fitment
Fitment
Warranty
Warranty
