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FiTech Ultimate LS EFI Fuel Injection System w/Hy-Fuel Tank, 750
FiTech Ultimate LS EFI Fuel Injection System w/Hy-Fuel Tank, 750

FiTech Ultimate LS EFI Fuel Injection System w/Hy-Fuel Tank, 750

Chevy LS V8

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FiTech Ultimate LS EFI Fuel Injection System w/Hy-Fuel Tank, 750
FiTech Ultimate LS EFI Fuel Injection System w/Hy-Fuel Tank, 750
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FiTech estimates this item will ship on or before January 18th.
Part # 52174003
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The FiTech Ultimate LS EFI kit is the ultimate LS ECU for DIY enthusiasts who want full control over their engine. Avoid having to buy additional software programs, learning how to think in computer code, or relying on a questionable 3rd party tuner. FiTech puts the engine and transmission EFI management back in your hands. The included color touch screen handheld controller allows for custom tuning adjustments to your LS engine as well as a self-learning program to get you on the road.

Leave the factory LS computer, wiring harness and intake in the junkyard where they belong. The FiTech Ultimate LS combo is a perfect match for 5.3 LS and 6.0 LS truck motors with tall and not so elegant factory intakes. The low profile fabricated sheet metal intake features short runners for a tricked out engine bay as compared to factory plastic engine covers. FiTech technology is custom cam friendly and is suitable for use with most 4.8 LS, 5.3 LS, LS1/LS6, and 6.0 LS engines with cathedral port cylinder heads producing up to 750 HP.

FiTech Fuel Injection now offers the Hy-Fuel In-Tank Retrofit Kit. You can experience the advantage of a high volume fuel system with the pump inside the fuel tank. With the pump submerged in fuel, it will run quieter and last longer. This is the easiest way to convert your existing or new fuel tank to an in-tank EFI fuel system.

  • Fabricated LS sheetmetal intake manifold
  • 102mm billet LS throttle body
  • Fuel rail with 55 lb/hr fuel injectors
  • Handheld controller with data logging capability and windshield mount
  • Fully programmable self-learning LS ECU
  • LS wiring harness¬†
  • Wideband O2 sensors
  • Includes Hy-Fuel Tank

Installation Instructions (PDF)



  • Intake manifold will fit Cathedral Port LS1/LS2/LS6 heads.
  • Small Block V8 GEN. III/IV LS-based Chevrolet street and performance engines with a 1500-6500 rpm power-band up to 750 HP to the flywheel and contains a 3 BAR MAP sensor for power adder applications that supports up to 30 PSI of boost.
  • ¬† 4.8 L / 293 c.i. LR4, LS1, LS2, LS6
  • ¬† 5.3 L / 325 c.i. L33, L59, LM4, LM7
  • ¬† 5.7 L / 346 c.i. LS1, LS6
  • ¬† 6.0 L / 364 c.i. LQ4, LQ9, LS2


*Does not include trans control

  • Intake manifold is 6.5 inches tall.
  • 102mm high flow cable operated throttle body sits at 7 degrees.
  • Throttle body will clear any stock truck accessories depending on the type of water pump, if there is truck water pump accessory clearance interference you will need to get a new water pump bracket.

Parts required, not included:

  • ¬†Coil packs

Optional, not included:

  • throttle cable mounting bracket (FiTech part number 70063)
Some parts are not legal for use in California or other states with similar laws/regulations

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What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • FiTech 70003 Ultimate LS EFI, LS1/LS2, 750 HP, w/o Trans Control
    Qty x 1
  • HyperFuel 40019 Hy-Fuel Single Pump In-Tank Retrofit Kit
    Qty x 1

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Q & A

Videos & Articles
  • Now that Project Chevelle is making some real power, it's time to give it a little more fuel. Follow along as we install a new tank and pump from Tanks Inc.
  • After installing the intake manifold and carbs on his 8BA, Heath P. continues on to the fuel and throttle setup. See how he mounts each part while making modifications to complete the install.

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