FiTech Nemesis Pushes EFI Airflow Limits For Serious Power

The FiTech Nemesis 4500 lineup is built to cover a wide range of high-horsepower EFI needs without forcing builders into a one-size-fits-all solution. Whether you’re sourcing a standalone throttle body to pair with an existing EFI system or starting fresh and want a complete plug-and-play kit capable of supporting up to 1,600 horsepower, there’s a FiTech Nemesis configuration for the job. Six part numbers make up the current lineup, split between four universal throttle bodies and two complete EFI systems, all sharing the same 4500 bolt pattern and serious airflow capability.

Nemesis Universal 4500 Standalone Throttle Bodies

For builders who already have an ECU, harness, and tune handled, the FiTech Nemesis Universal 4500 throttle body fills the gap without unnecessary overhead. All four standalone units share a common feature set: a 4500 bolt pattern that fits race-style and high-rise intake manifolds, more than 2400 cfm of airflow capacity, a 1:1 throttle linkage for sharp and linear response, an integrated IAC motor for stable idle control, and multiple vacuum and boost reference ports with adjustable porting for draw-through boosted applications. A threaded IAT sensor port is included on each unit to support blow-through and boosted setups.

Where the four configurations differ is in finish and sensor type. P/N 30036 and P/N 30037 are equipped with a MAP sensor configuration, delivering accurate manifold pressure data for custom EFI systems where precise pressure readings are critical. The MAP setup works well for naturally aspirated combinations and boosted builds running systems that handle temperature compensation separately. 

The other two units, P/N 30038 and P/N 30039, step up to TMAP sensor capability, combining temperature and pressure monitoring in a single sensor. For boosted applications and nitrous combinations where intake air temperature directly influences fuel delivery accuracy, the TMAP configuration simplifies the installation and gives the EFI system exactly the data it needs.

Finish choices break down cleanly between the two sensor types. P/N 30036 and P/N 30038 come in a stealthy black finish suited for race-ready builds where function comes first. P/N 30037 and P/N 30039 are finished in FiTech’s Brilliant polished aluminum, a show-quality look for builders who want the throttle body to stand out under the hood as much as it performs.

Nemesis 4500 Complete EFI System

For builders starting from scratch or making the switch from carburetion, the FiTech Nemesis 4500 EFI System takes everything in the standalone throttle body lineup and adds the electronics and sensors needed to make it a complete, self-learning fuel injection setup.

The system is rated to support up to 1,600 horsepower and flows 1820 cfm at 20.4 inH₂O and 2146 cfm at 28 inH₂O. Eight high-flow injectors handle fuel delivery, and dual IAC motors manage idle quality with precision.

The FiTech Nemesis was engineered with a parabolic entry and 2.300-inch throttle blades, a combination that produces crisp throttle response at low speeds while still delivering the top-end airflow that high-output engines demand. A primary shaft TPS feeds accurate throttle position data to the ECU, and three-bar TMAP compatibility means the system is ready for boosted applications without additional hardware. The CNC-machined body is built to handle the demands of both race and high-performance street use.

The complete kit includes the ECU, wiring harness, and all essential sensors, so there’s no need to source components separately. FiTech’s self-learning technology handles the tuning process as the engine accumulates run time, making the system approachable for a wide range of builders without sacrificing the capability that serious combinations require.

Part number 30070 is finished in bright aluminum, and P/N 30080 comes in black hard-anodized aluminum. Both deliver identical performance, so the choice comes down to what works best for the application aesthetically.

The Right Nemesis For The Build

With six configurations covering two finishes, two sensor types, and the option between a standalone throttle body and a complete EFI kit, the FiTech Nemesis 4500 lineup gives builders a clear path to the right solution. Whether the goal is integrating a high-flow throttle body into an existing setup or building a complete EFI system around a 1600-horsepower combination, there’s a FiTech Nemesis built for it.