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Rear Suspension Kits

Ditch your clunky factory rear springs for a QA1 Rear Coilover System. Get ride height adjustability while improving ride quality and performance.

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550-905 Holley EFI Terminator X - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3 58x Crank - 4x Cam - EV6 Injectors - 3.5 in. Touchscreen
550-905 Holley EFI Terminator X - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3 58x Crank - 4x Cam - EV6 Injectors - 3.5 in. Touchscreen
Part Number: 550-905
$1,427.95
Holley EFI Terminator X - Gen III 4.8/5.3/6.0 GM Truck Engines 24x Crank - 1x Cam - Multec 2 Injectors - USB/CAN Tuning Cable
Holley EFI Terminator X - Gen III 4.8/5.3/6.0 GM Truck Engines 24x Crank - 1x Cam - Multec 2 Injectors - USB/CAN Tuning Cable
Part Number: 550-904T
$1,411.95
550-904 Holley EFI Terminator X - Gen III 4.8/5.3/6.0 GM Truck Engines 24x Crank - 1x Cam - Multec 2 Injectors - 3.5 in. Touchscreen
550-904 Holley EFI Terminator X - Gen III 4.8/5.3/6.0 GM Truck Engines 24x Crank - 1x Cam - Multec 2 Injectors - 3.5 in. Touchscreen
Part Number: 550-904
$1,427.95
Holley EFI Terminator X - GM LS1/LS6 24x Crank - 1x Cam - EV1 Injectors - USB/CAN Tuning Cable
Holley EFI Terminator X - GM LS1/LS6 24x Crank - 1x Cam - EV1 Injectors - USB/CAN Tuning Cable
Part Number: 550-903T
$1,411.95
Holley EFI Terminator X - GM LS1/LS6 24x Crank - 1x Cam - EV1 Injectors - 3.5 in. Touchscreen
Holley EFI Terminator X - GM LS1/LS6 24x Crank - 1x Cam - EV1 Injectors - 3.5 in. Touchscreen
Part Number: 550-903
$1,427.95
Hilborn Terminator X MPFI Universal Universal Terminator X MPFI Kit for Hilborn EFI Systems
Hilborn Terminator X MPFI Universal Universal Terminator X MPFI Kit for Hilborn EFI Systems
Part Number: 550-718
$1,213.95
Dominator EFI Kit - LS2 Main Harness w/ Trans and DBW with EV1 Injector Harness Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors a 4L60/80E Transmission, and a DBW Throttle Body
Dominator EFI Kit - LS2 Main Harness w/ Trans and DBW with EV1 Injector Harness Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors a 4L60/80E Transmission, and a DBW Throttle Body
Part Number: 550-660
$3,399.95
Dominator EFI Kit - LS2 Main Harness w/ DBW with EV1 Injector Harnesses Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors, and a DBW Throttle Body
Dominator EFI Kit - LS2 Main Harness w/ DBW with EV1 Injector Harnesses Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors, and a DBW Throttle Body
Part Number: 550-659
$3,349.95
Dominator EFI Kit - LS2 Main Harness w/ Trans Control with EV1 Injector Harness Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors, and a 4L60/80E Transmission
Dominator EFI Kit - LS2 Main Harness w/ Trans Control with EV1 Injector Harness Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors, and a 4L60/80E Transmission
Part Number: 550-658
$3,349.95
Dominator EFI Kit - LS1 Main Harness w/ Trans and DBW with EV1 Injector Harness Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors a 4L60/80E Transmission, and a DBW Throttle Body.
Dominator EFI Kit - LS1 Main Harness w/ Trans and DBW with EV1 Injector Harness Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors a 4L60/80E Transmission, and a DBW Throttle Body.
Part Number: 550-657
$3,399.95
Dominator EFI Kit - LS1 Main Harness w/ Trans Control with EV1 Injector Harness Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors, and a 4L60/80E Transmission
Dominator EFI Kit - LS1 Main Harness w/ Trans Control with EV1 Injector Harness Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors, and a 4L60/80E Transmission
Part Number: 550-656
$3,349.95
Dominator EFI Kit - Ford - COP Main Harness With Coil on Plug Main and Sub Harness with EV1 Injector Harness Fits conventional push rod Ford Engines with coil on plug ignition and EV1 Injectors
Dominator EFI Kit - Ford - COP Main Harness With Coil on Plug Main and Sub Harness with EV1 Injector Harness Fits conventional push rod Ford Engines with coil on plug ignition and EV1 Injectors
Part Number: 550-655
$3,249.95
Dominator EFI Kit - Universal - COP Main Harness With Coil on Plug Main and Sub Harness with EV1 Injector Harness Fits Domestic V8 engines, such as conventional push rod Chevrolet and Chrysler engines with Coil on Plug ignition and EV1 Injectors
Dominator EFI Kit - Universal - COP Main Harness With Coil on Plug Main and Sub Harness with EV1 Injector Harness Fits Domestic V8 engines, such as conventional push rod Chevrolet and Chrysler engines with Coil on Plug ignition and EV1 Injectors
Part Number: 550-654
$3,249.95
Dominator EFI Kit - Ford Main Harness with EV1 Injector Harness Fits conventional push rod Ford Engines, with EV1 Injectors
Dominator EFI Kit - Ford Main Harness with EV1 Injector Harness Fits conventional push rod Ford Engines, with EV1 Injectors
Part Number: 550-653
$3,049.95
Dominator EFI Kit - Universal Main Harness with EV1 Injector Harness Fits Domestic V8 engines, such as conventional push rod Chevrolet and Chrysler engines, with EV1 Injectors
Dominator EFI Kit - Universal Main Harness with EV1 Injector Harness Fits Domestic V8 engines, such as conventional push rod Chevrolet and Chrysler engines, with EV1 Injectors
Part Number: 550-652
$3,049.95
Dominator EFI Kit - LS2 Main Harness with EV1 Injector Harness Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors
Dominator EFI Kit - LS2 Main Harness with EV1 Injector Harness Fits GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 style Engines with EV1 Injectors
Part Number: 550-651
$3,049.95
Dominator EFI Kit - LS1 Main Harness with EV1 Injector Harness Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors
Dominator EFI Kit - LS1 Main Harness with EV1 Injector Harness Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors
Part Number: 550-650
$3,049.95
Ford Coyote Ti-VCT Capable HP EFI Kit, NTK O2 HP EFI ECU with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes NTK Oxygen Sensor (Does not include Ti-VCT Controller or Harnesses)
Ford Coyote Ti-VCT Capable HP EFI Kit, NTK O2 HP EFI ECU with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes NTK Oxygen Sensor (Does not include Ti-VCT Controller or Harnesses)
Part Number: 550-628N
$2,899.95
Ford Coyote Ti-VCT Capable HP EFI Kit, Bosch O2 HP EFI ECU with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes Bosch Oxygen Sensor (Does not include Ti-VCT Controller or Harnesses)
Ford Coyote Ti-VCT Capable HP EFI Kit, Bosch O2 HP EFI ECU with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes Bosch Oxygen Sensor (Does not include Ti-VCT Controller or Harnesses)
Part Number: 550-628
$2,649.95
2013-2015.5 Ford Coyote Ti-VCT HP EFI Kit, NTK O2, USCAR INJ Ford Coyote Ti-VCT HP EFI ECU and Ti-VCT Controller Kit with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes NTK Oxygen Sensor
2013-2015.5 Ford Coyote Ti-VCT HP EFI Kit, NTK O2, USCAR INJ Ford Coyote Ti-VCT HP EFI ECU and Ti-VCT Controller Kit with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes NTK Oxygen Sensor
Part Number: 550-625N
$3,849.95
2011-2012 Ford Coyote Ti-VCT HP EFI Kit, NTK O2, USCAR INJ Ford Coyote Ti-VCT HP EFI ECU and Ti-VCT Controller Kit with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes NTK Oxygen Sensor
2011-2012 Ford Coyote Ti-VCT HP EFI Kit, NTK O2, USCAR INJ Ford Coyote Ti-VCT HP EFI ECU and Ti-VCT Controller Kit with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes NTK Oxygen Sensor
Part Number: 550-619N
$3,499.95
2011-2012 Ford Coyote Ti-VCT HP EFI Kit, BOSCH O2, USCAR INJ Ford Coyote Ti-VCT HP EFI ECU and Ti-VCT Controller Kit with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes Bosch Oxygen Sensor
2011-2012 Ford Coyote Ti-VCT HP EFI Kit, BOSCH O2, USCAR INJ Ford Coyote Ti-VCT HP EFI ECU and Ti-VCT Controller Kit with Power Harness, Main Harness, Coil Harness, Injector Harness and Sensors includes Bosch Oxygen Sensor
Part Number: 550-619
$3,249.95
HP EFI ECU & Harness Kits Complete 99-04 4 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits Complete 99-04 4 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Includes NTK Oxygen Sensor
Part Number: 550-617N
$3,299.95
550-617 HP EFI ECU and Harness Kits Complete 99-04 4 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Bosch Wideband O2
550-617 HP EFI ECU and Harness Kits Complete 99-04 4 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Bosch Wideband O2
Part Number: 550-617
$3,049.95
HP EFI ECU and Harness Kits Complete 99-04 2 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Includes NTK Oxygen Sensor
HP EFI ECU and Harness Kits Complete 99-04 2 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Includes NTK Oxygen Sensor
Part Number: 550-616N
$3,299.95
550-616 HP EFI ECU & Harness Kits Complete 99-04 2 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Bosch Wideband O2
550-616 HP EFI ECU & Harness Kits Complete 99-04 2 Valve Ford Modular Engine Plug and Play Kit - Jetronic "Bosch Style" injector harness - Bosch Wideband O2
Part Number: 550-616
$3,049.95
Terminator LS MPFI Kit 1997-2007 4.8/5.3/6.0 Truck Engines with 24x crank reluctor - with DRIVE-BY-WIRE, No Laptop Required, 3.5" Touchscreen Included
Terminator LS MPFI Kit 1997-2007 4.8/5.3/6.0 Truck Engines with 24x crank reluctor - with DRIVE-BY-WIRE, No Laptop Required, 3.5" Touchscreen Included
Part Number: 550-615
$4,049.95
Terminator LS MPFI Kit 1997-2007 4.8/5.3/6.0 Truck Engines with 24x crank reluctor, No Laptop Required, 3.5" Touchscreen Included
Terminator LS MPFI Kit 1997-2007 4.8/5.3/6.0 Truck Engines with 24x crank reluctor, No Laptop Required, 3.5" Touchscreen Included
Part Number: 550-614
$2,749.95
Terminator LS MPFI Kit GM LS2/LS3 Engines and 2007 to current 4.8/5.3/6.0 Truck Engines with 58x crank reluctor - with DRIVE-BY-WIRE & TRANSMISSION CONTROL, No Laptop Required, 3.5" Touchscreen Included
Terminator LS MPFI Kit GM LS2/LS3 Engines and 2007 to current 4.8/5.3/6.0 Truck Engines with 58x crank reluctor - with DRIVE-BY-WIRE & TRANSMISSION CONTROL, No Laptop Required, 3.5" Touchscreen Included
Part Number: 550-613
$4,349.95
HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes NTK Oxygen Sensor
Part Number: 550-607N
$2,899.95
550-607 HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes Bosch Oxygen Sensor
550-607 HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness (fits Holley 522-xxx injectors), Includes Bosch Oxygen Sensor
Part Number: 550-607
$2,649.95
HP EFI ECU & Harness Kits Universal FORD V8 Multi-Point Fuel Injection, Includes NTK Oxygen Sensor, and Ford V8 Injector Harness.
HP EFI ECU & Harness Kits Universal FORD V8 Multi-Point Fuel Injection, Includes NTK Oxygen Sensor, and Ford V8 Injector Harness.
Part Number: 550-606N
$2,799.95
HP EFI ECU & Harness Kits Universal FORD V8 Multi-Point Fuel Injection, Includes Bosch Oxygen Sensor, and Ford V8 Injector Harness.
HP EFI ECU & Harness Kits Universal FORD V8 Multi-Point Fuel Injection, Includes Bosch Oxygen Sensor, and Ford V8 Injector Harness.
Part Number: 550-606
$2,549.95
HP EFI ECU & Harness Kits Unterminated Universal Harness, Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits Unterminated Universal Harness, Includes NTK Oxygen Sensor
Part Number: 550-605N
$2,799.95
HP EFI ECU & Harness Kits Unterminated Universal Harness, Includes Bosch Oxygen Sensor
HP EFI ECU & Harness Kits Unterminated Universal Harness, Includes Bosch Oxygen Sensor
Part Number: 550-605
$2,549.95
HP EFI ECU & Harness Kits Universal V8 Multi-Point Fuel Injection, Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits Universal V8 Multi-Point Fuel Injection, Includes NTK Oxygen Sensor
Part Number: 550-604N
$2,799.95
HP EFI ECU & Harness Kits Universal V8 Multi-Point Fuel Injection, Includes Bosch Oxygen Sensor
HP EFI ECU & Harness Kits Universal V8 Multi-Point Fuel Injection, Includes Bosch Oxygen Sensor
Part Number: 550-604
$2,549.95
HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes NTK Oxygen Sensor
Part Number: 550-603N
$2,899.95
550-603 HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes Bosch Oxygen Sensor
550-603 HP EFI ECU & Harness Kits GM LS2/3/7 (58x crank sensor) with USCAR (EV6 Style) connectors on injector harness, Includes Bosch Oxygen Sensor
Part Number: 550-603
$2,649.95
HP EFI ECU & Harness Kits GM LS1/LS6 (24x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness, Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits GM LS1/LS6 (24x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness, Includes NTK Oxygen Sensor
Part Number: 550-602N
$2,899.95
550-602 HP EFI ECU & Harness Kits GM LS1/LS6 (24x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness, Includes Bosch Oxygen Sensor
550-602 HP EFI ECU & Harness Kits GM LS1/LS6 (24x crank sensor) with Jetronic/Minitimer (Bosch type) connectors on injector harness, Includes Bosch Oxygen Sensor
Part Number: 550-602
$2,649.95
HP EFI ECU & Harness Kits GM TPI and Holley Stealth Ram?, Includes NTK Oxygen Sensor
HP EFI ECU & Harness Kits GM TPI and Holley Stealth Ram?, Includes NTK Oxygen Sensor
Part Number: 550-601N
$2,799.95
HP EFI ECU & Harness Kits GM TPI and Holley Stealth Ram?, Includes Bosch Oxygen Sensor
HP EFI ECU & Harness Kits GM TPI and Holley Stealth Ram?, Includes Bosch Oxygen Sensor
Part Number: 550-601
$2,549.95
HP EFI Universal MPI Retrofit Kits HP EFI Universal MPI Retrofit Kit, 4500? carburetor style intake manifolds
HP EFI Universal MPI Retrofit Kits HP EFI Universal MPI Retrofit Kit, 4500? carburetor style intake manifolds
Part Number: 550-501
$4,649.95
HP EFI Universal MPI Retrofit Kits HP EFI Universal MPI Retrofit Kit, 4150? carburetor style intake manifolds
HP EFI Universal MPI Retrofit Kits HP EFI Universal MPI Retrofit Kit, 4150? carburetor style intake manifolds
Part Number: 550-500
$3,649.95
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