4.7 · 3 reviews
SKU: 550-1063

EFI Terminator X Max Stealth 4150

$2,820.00
FREE delivery
Description

ABOUT THIS PRODUCT

The Terminator X Stealth 4150 system features (4) 100 lb./hr. fuel injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. Taking the Stealth name, all of the wiring exits below the rear fuel injector cover for a clean installation. The timed spark port for vacuum advanced distributors is located under the front fuel bowl, giving greater access to the distributor. Air entry is machined to fit most stock air cleaners with air cleaner locator provisions. The ECU features fuel maps that self-learn and integrated ignition timing control, yielding improved idle stability, drivability, and horsepower at wide-open throttle (WOT). The Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications for making installation more convenient. These kits provide plug and play transmission control for GM 4L60 and 4L80 transmissions.

Product Features:
  • (4) 100 lb./hr. fuel injectors supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications
  • 3.5" LCD handheld touchscreen for setup, tuning, gauge displays, and other viewing parameters
  • Initial handheld calibration wizard creates a base tune with no laptop needed
  • Advanced annular discharge rings for more fuel flow and better fuel atomization, nearly eliminating the fuel delay issues found on other designs
  • Bosch LSU 4.9 Wideband Oxygen (O2) Sensor for maximum performance on real time fuel map learning
  • OEM style TPS/IAC robust design for longevity
  • Internal 1 Bar MAP sensor built into the ECU
  • Bolt on 4150 flange carburetor replacement fits many factory intake manifolds
  • Air entry is machined to fit many stock style air cleaners with air cleaner locator provisions
  • Plug and play transmission control for GM transmissions
  • Integrated ignition timing control improves idle stability, fuel economy, and wide open throttle (WOT)
  • All wiring exits below the rear fuel injector cover for a stealth installation
  • For 24x or 58x GM LS engines
  • Four inputs include 12V, ground, 5V, and frequency, for pressure sensors, activation triggers, trans brake, etc.
  • Fuel and Oil Pressure inputs are pre-terminated
  • Four outputs include ground, PWN-, for fans, boost and nitrous control, IAC, etc.
  • Requires an external fuel pressure regulator with base pressure set to 58.5 PSI (Holley P/N 12-886 or equivalent)
Specifications
Brand
Holley EFI (770)
SKU
550-1063
Product type
Automotive
Guides & Resources
User Guide
Returns Policy
Shipping Information

Free shipping on all orders. Most items ship next business day after your order is placed.

Returns Policy

Returns are accepted when the product is in its original, unopened container. Contact us if you have questions about your order.

View full returns policy

Customer Reviews

4.7

Based on 3 reviews

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C
Chris W. Verified Buyer
07/05/2025

Highly recommend

Good experience overall from checkout to delivery.

J
Jordan L. Verified Buyer
04/15/2025

Very happy with this

Packaging was secure and the item was in perfect condition.

E
Emma S. Verified Buyer
12/14/2025

Exactly what I needed

Easy to order and arrived quickly. Product matched the listing and works great.

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