Installation GuideLexus LX 600 3.4L(2022-2027)

Quick pre-install step

Power down before you begin.

Turn the vehicle off, close the doors, move the key away, and leave it undisturbed.

  • Ignition off
  • Hood open
  • Door Closed
  • Key Away
15Minutes

Estimated wait before installing

STEP 01

Remove Engine Cover

Lift front of engine cover to remove.

Remove Engine Cover
STEP 02

Find the Front TMAP Sensor

The front TMAP sensor is mounted on the front of the intercooler.

Find the Front TMAP Sensor

Tip: Circled sensor = Front TMAP.

STEP 03

Install Front TMAP Pass-Through

The Stealth harness goes in between the sensor and the factory truck plug.

Install Front TMAP Pass-Through
  1. 1

    Stealth to Sensor

    Plug the Stealth connector labeled TMAP into the TMAP sensor.

  2. 2

    Factory to Stealth

    Plug the factory truck connector into the corresponding Stealth connector.

  3. 3

    Verify Both Clicks

    Push until both sides click, then lightly tug the connector bodies to confirm they are locked.

Warning: Seal Check: The weather seals should stay seated and the connector faces should close fully. A half-seated connector can cause codes.

STEP 04

Find and Connect Rear MAP Sensor

The rear MAP sensor is toward the back of the engine and may be partially hidden.

Find and Connect Rear MAP Sensor
STEP 05

Connect Rear MAP Sensor

Use the wide photo to find the area, then use the close-up to identify the connector. Unplug the factory plug, then install the Stealth harness the same way you did on the front sensor.

Connect Rear MAP Sensor

Tip: Space Is Tight: Take your time. Use the connector body, not the wires, and confirm the plug clicks into place.

You choose

The 4 positions

Move up one step at a time. More power is only better when the truck is happy.

STOCK

Stock

No added power

Factory-style pass-through. Completely off.

LOW

Low

First drive / daily

Start here. Smooth added power without pushing the.

MED

Medium

Strong / daily

More boost and response for a healthy truck on.

HIGH

High

Maximum output

Strongest pull. Back down in heat, heavy load, or any.

Shift on the fly

You are able to change the switch settings at anytime while the vehicle is on or off. If the switch is disconnected your module will default to stock.

Truck not happy? Turn it down.

Hesitation, pinging/spark knock, misfire codes (P0300/P030X), reduced power, or a check-engine light means the setting, fuel, or conditions are not right. Lower one setting and run fresh 91+ before calling support.