Product Summary

Universal Fit, Throttle Body Injection Style, Natural

  • FiTech Go Street EFI 400 HP Self-Tuning Fuel Injection with Force Fuel Systems make the switch from carburetor to EFI about as easy as it gets
  • Good for up to 400 hp, these 4-injector throttle bodies simply swap out your current 4-barrel carburetor for EFI performance
  • 4-Barrel Square Bore
  • Self-Tuning ECU
  • Attractive cast finish

Rebates Available

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Key Specs

Injection StyleThrottle Body
Injector Size62 lbs./hr.
Max Horsepower Rating400
ECM IncludedYes
Throttle Body StyleThrottle Body Injection (TBI)
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Need To Know

Quick and Easy Returns

Return Policy

FiTech 35203 Details

The Go Street EFI 400HP Self Tuning Fuel Injection System is rated at 400 HP but is suitable for engines from 100hp thru 400hp. The Game Changer has arrived from FiTech with its latest addition to the line of Go EFI Throttle Body EFI systems. FiTech recognizes that not everyone needs or has 600HP or a wild camshaft. There is a large group of enthusiasts who are happy with their ZZ4 crate engine or their ’66 Mustang’s factory engine, but still want the advantage that EFI has to deliver. Fitech has taken your needs into consideration and built an EFI designed just for that purpose.

The Go Street EFI is a ready-to-run system that strays away from the programmable features and sticks to the basic functions necessary to get the best performance and economy out of your street and mild performance engine. FiTech once again allows you to ditch that old carburetor and advance into the EFI world at the most affordable price on the planet! Leave it to the experts in affordable EFI, we are always looking for ways to save our customers money while delivering the BEST performance possible!

Applications:

  • Chevrolet, Pontiac, Ford, Chrysler, Dodge, Plymouth, Etc. engines making 150 HP up to 400 HP with a 4-barrel intake manifold.
  • Replacement for any 4-barrel carburetors for engines with 150 HP up to 400 HP.
  • Use the same size air cleaner you would normally use for your 4-barrel carburetor.

Not legal for use on pollution-controlled vehicles. This system is designed to be installed in vehicles that do not require emission controls.

Features

  • 1 BAR internal MAP sensor.
  • Suitable for up to 400hp.
  • (4) Flow matched injectors.
  • (1) Fan control & AC Input.
  • Built-in pressure regulator.
  • Attractive cast finish.

Kit Contents

  • (1) Die-cast throttle body.
  • (1) O2 bung kit.
  • (1) Hand-held controller.
  • (1) CTS sensor.
  • (1) Hand-held controller cable.
  • (1) CTS adapter.
  • (1) Windshield mount.
  • (1) Mini USB cable.
  • (1) 4+2-Pin Connector.
  • (1) Return plug.
  • (1) O2 sensor.
  • (1) Gasket kit.

This Master Kit is equipped with FiTech EFI 50004 Go Fuel Force Surge Tank

The all new FiTech Force Fuel System makes the upgrade to fuel injection even easier! The Force Fuel simply connects to a stock mechanical or electric fuel pump then supplies the EFI system with high pressure through the use of an internal 340-LPH pump. This means you don’t need to run a new feed line from the tank!

With a strong, versatile mounting bracket, the Force Fuel System mounts under and is fed with the original fuel pump. The assembly holds half-a- gallon of fuel to submerge the electric fuel pump to keep it cool for long life and no chance of fuel starvation. An internal regulator keeps the pressure at a consistent 58-psi which is ideal for reliable EFI performance.

A serviceable 10-micron fuel filter is supplied to keep the finest debris away from the injectors along with five feet of high pressure fuel hose, AN fittings and clamps. The precision machined extrusion is designed for strength and sealed tight. There is also an easy-to-view fuel pressure gauge installed for quick checks and heavy duty wire terminals are also supplied to complete the installation.

Rebates

FiTech 10% Off Select Parts Labor Day Sale 2026

FiTech 10% Off Select Parts Labor Day Sale 2026FitechLaborDay10%OffSale2026

FiTech Fuel Injection is pleased to announce our Labor Day Specials, running from September 1, 2026, through September 30, 2026. For a limited time, customers can save over $350 on Ultra Port EFI systems and EFI Master Kits, making it the perfect opportunity to upgrade to modern fuel injection with improved performance and drivability. 10% off applicable parts. Sale prices are applicable only to purchases made within the specified sale period, from September 1, 2026, to September 30, 2026. No rainchecks or exceptions will be provided. Sale price is valid through September 30. Regular MAP Pricing will be reinforced on October 1, 2026. This sale cannot be combined with any other offers, discounts, or promotions. Co-ops will be honored.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

FiTech 35203 Specifications

KEY SPECS
MFG. Part #35203
BrandFiTech
Injection StyleThrottle Body
Injector Size62 lbs./hr.
Max Horsepower Rating400
ECM IncludedYes
Throttle Body StyleThrottle Body Injection (TBI)
GENERAL
Carburetor Flange Type4-Barrel Square Bore
Fuel Injection System TypeSingle 4-Barrel Throttle Body (4150 Flange)
CFM850 CFM
User TunableYes
Self TuningYes
Injectors IncludedYes
Intake Manifold IncludedNo
Metering StyleSpeed density
EGRNo
Throttle Body IncludedYes
Throttle Body MaterialAluminum
Throttle Body FinishNatural
Throttle Body Flange Type4-Barrel Square Bore
Venturi Quantity4
Fuel Pump IncludedYes
Fuel Rails IncludedNo
Calibration Module IncludedYes
Wiring Harness IncludedYes
Fuel Pressure Regulator IncludedYes
Distributor IncludedNo
MAP Sensor IncludedYes
IAC Motor IncludedYes
IAT Sensor IncludedYes
TPS Sensor IncludedYes
Use with Power AdderNo
Venturi Diameter43.00mm
Throttle Body Barrels4-Barrel
Flow Rating340
GTIN Code812061032124
Sold in QuantityEach
Transmission Controller IncludedNo
Multi-Port Fuel Rails IncludedNo
Fuel Injection StyleThrottle body
Timing Control CompatibleNo

Ratings & Reviews

5

3 Reviews

Overall Assessment

Customers have highly praised our product's quality and easy-to-use feature. The detailed instructions have proved to be incredibly helpful, aiding in troubleshooting technical issues effectively. The product stands out for its excellent performance noted in the improved functioning of the engine with the new O2 sensor. Its key feature is its practicality, serving as a direct fit for cars that eliminates any need to adjust the carburetor again. Superior to its competitors, this system provides assurance and durability, greatly enhancing the user experience.

5

3 reviews

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I would buy this EFI unit again

5.0

10 months ago

Al

SJ CA

Verified

Got rid of the carb and replace with the Fitech EFI unit.

Would Recommend

Super detailed instructions

5.0

3 years ago

66 mustang 351c

Renton, Wa

Verified

After the initial start the O2 sensor was showing super low numbers so the throttle body was dumping fuel and causing a rich condition which would cause the engine to die. I called the tech hot line and explained to the tech what was happening and he assured me it had to be an exhaust leak. I decided to swap out the sensor and what do you know..... car ran great.

Would Recommend

Great item, a direct fit

5.0

3 years ago

CJ8 Conversion

Enterprise AL

Verified

Really a great system. Dontbhave to worry about adjusting the carb again.

Would Recommend

Showing 3 of 3 reviews

Questions & Answers

2 Questions • 2 Answers

Will this work on a de-smogged Ford Bronco 302? What manifold/ignition set up would you recommend?

by Phil

• 3 years ago

1 answer

What are the dimensions on the force fuel delivery system I need to figure out if I have room and where I can locate it

by ChevyII

• 3 years ago

1 answer

2 of 2 questions shown

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