ECUs for 1998-2005 Lexus GS300
Build a reliable engine management system with premium ECUs, wiring harnesses, and electronic solutions from FIGS.
Whether you're replacing factory engine management or building a fully customized performance vehicle, FIGS offers the electronic components needed for a dependable and professional installation. Our selection includes standalone ECUs, plug-and-play wiring harnesses, adapter harnesses, and motorsport-grade wiring solutions designed to simplify installation while providing the flexibility modern performance builds demand.
Featuring products from trusted manufacturers including Haltech, Boomslang Fabrication, and Autosport Wiring, our ECU and wiring solutions support everything from street-driven projects to dedicated race cars. Whether you're installing a standalone engine management system, completing an engine swap, or upgrading your vehicle's electrical infrastructure, FIGS provides proven solutions engineered for performance, reliability, and seamless integration.
BUSHINGS
25 products
OE STYLE REPLACEMENT ARMS
8 products
TOE/TRAC LINKS
7 products
ECUs
18 products
TIE RODS/BALL JOINTS
10 products
SWAY BARS AND ENDLINKS
7 products
FIGS ADJUSTABLE UCAs
6 products
BEARINGS
5 products
REFRESH KITS
4 products
MEGA REAR KITS
3 products
TURBOS/SUPERCHARGERS
8 products
DIFFERENTIAL/LSD
5 products
HEADERS
3 products
E-BRAKE KITS
2 products
EXHAUST
2 products
FIGS ADJUSTABLE LCAs
2 products
HYSTEER KNUCKLES
2 products
SEATING
2 products
BRAKE KITS
3 products
ENGINE COOLING
1 product
ESSENTIAL KIT FOR LOWERING
1 product
FIGS PROANGLE DRIFT KITS
1 product
HOOD/TRUNK SUPPORT
1 product
VEHICLE BRACING
1 product
VIP KITS
1 product
ENGINE COMPONENTS
36 products
RADIATOR/HEATER HOSE KITS
20 products
WHEELS/TIRES AND ACC
19 products
BRAKE ROTORS AND PADS
12 products
MAINTENANCE
12 products
LIGHTING
9 products
INTAKES
8 products
COILOVERS
6 products
FUEL DELIVERY
6 products
BODY/AERO
2 products
BRAKE LINES
2 products
CAMBER BOLTS
2 products
DRIVETRAIN
2 products
ENGINE MOUNTS
2 products
INTERIOR PARTS
1 product
SHOCKS AND SPRINGS
1 product
2002-2005 LEXUS GS300 Haltech ECU 2500 W/ Boomslang Wiring Harness
This powerful combination features the Haltech Elite 2500 ECU, a versatile and advanced engine manag..
$2,587.80
1998-2001 LEXUS GS300 Haltech ECU 2500 W/ Boomslang Wiring Harness
This powerful combination features the Haltech Elite 2500 ECU, a versatile and advanced engine manag..
$2,587.80
1998-2001 LEXUS GS300 Haltech ECU 750 W/ Boomslang Wiring Harness
This setup includes the Haltech Elite 750 ECU, a highly advanced and compact engine management syste..
$1,865.80
2002-2005 LEXUS GS300 Haltech ECU 750 W/ Boomslang Wiring Harness
This setup includes the Haltech Elite 750 ECU, a highly advanced and compact engine management syste..
$1,865.80
1998-2001 LEXUS GS300 Haltech ECU R3 W/ Boomslang Wiring Harness
This setup features the Haltech Nexus R3 VCU, a cutting-edge vehicle control unit that offers advanc..
$3,005.80
2002-2005 LEXUS GS300 Haltech ECU R3 W/ Boomslang Wiring Harness
This setup features the Haltech Nexus R3 VCU, a cutting-edge vehicle control unit that offers advanc..
$3,109.35
1998-2001 LEXUS GS300 Boomslang Wiring Harness for Haltech 2500
Simplify the wiring of your ECU install with a wiring harness from Boomslang. Built specicifically f..
$840.00
2002-2005 LEXUS GS300 Boomslang Wiring Harness for Haltech 2500
Simplify the wiring of your ECU install with a wiring harness from Boomslang. Built specicifically f..
$840.00
2002-2005 LEXUS GS300 Boomslang Wiring Harness for Haltech Nexus R3
The Boomslang Harness for the Haltech Nexus R3 is a high-quality wiring solution that simplifies the..
$874.00
2002-2005 LEXUS GS300 ECU PATCH HARNESS
If you are looking to relocate the factory harness, without cutting and splicing 100 wires, we ..
$369.55 $389.00
1998-2001 LEXUS GS300 ECU PATCH HARNESS
If you are looking to relocate the factory harness, without cutting and splicing 100 wires, we ..
$189.05 $199.00
1998-2001 LEXUS GS300 Boomslang Wiring Harness for Haltech 750
Simplify the wiring of your ECU install with a wiring harness from Boomslang. Built specicifically f..
$840.00
2002-2005 LEXUS GS300 Boomslang Wiring Harness for Haltech 750
Simplify the wiring of your ECU install with a wiring harness from Boomslang. Built specicifically f..
$840.00
1998-2001 LEXUS GS300 Boomslang Wiring Harness for Haltech Nexus R3
The Boomslang Harness for the Haltech Nexus R3 is a high-quality wiring solution that simplifies the..
$765.00
1998-2001 LEXUS GS300 Boomslang Wiring Harness for Haltech Nexus R5
Simplify the wiring of your ECU install with a wiring harness from Boomslang. Built specicifically f..
$765.00
