Skip to product information
1 of 19

The Tuner Store

EFI Terminator X Stealth GM LS 4150 - Shiny - 24X Crank - 4 Injectors - 650 HP

Regular price $2,249.95
Sale price $2,249.95 Regular price $2,249.95

In stock
Sorry, it's out of stock.

But we can let you know when it's back in.

Payment methods
  • Amazon
  • American Express
  • Apple Pay
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • USDC
  • Visa
Shop safely with us
  • Secure Checkout
  • Warranty Backed
  • Genuine Parts

550-1020

90127107591

EFI Terminator X Stealth GM LS 4150 - Shiny - 24X Crank - 4 Injectors - 650 HP

Holley EFI Terminator X Stealth GM LS 4150 - Shiny

Pre-2009 GM 4L60E/4L80E Transmission Control - 1250 HP

Overview
The Terminator X Stealth 4150 1250HP EFI system from Holley features 8, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 1250 HP on forced induction applications. The Terminator X ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications? Terminator X Max Stealth 4150 kits provide transmission control for Pre-2009 GM 4L60E/4L80E Transmissions (Part numbers 550-1014, 550-1015, 550-1016)

Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or before due to year-by-year changes in converter lockup and downshift strategy.

Features:
  • Terminator X Stealth 4150 Kits for either 24x or 58x LS engines
  • Supports up to 650HP with Four 100lb./hr. Injectors
  • Terminator X Max kits provide plug and play Transmission control for GM Transmissions
  • Internal 1bar MAP sensor, built into the Terminator X ECU.
  • All of the wiring exits below the fuel injector bowls, for a completely stealth installation
  • Air entry machined to fit most stock style air cleaners with air cleaner locator provisions
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886
  • Integrated ignition timing control ????????"Plug and play with factory LS coil sub harness and OEM LS coils ????????" no external boxes/modules needed to run Coil Near Plug
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
  • Self-tuning ECU means you don??????????????t have to be a computer/tuning wiz to have EFI!
  • 4 Inputs ????????" 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake (Fuel and Oil Pressure Inputs are pre-terminated)
  • 4 Outputs ????????" Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
  • OEM Style TPS/IAC, for years of dependable service
  • Available in 3 finishes: Shiny, Black and Gold
  • Compatible with Holley EFI digital dashes, gauges and fuel system accessories


Details:
  • Color: Shiny
  • Ignition Type: GM LS 24x
  • Injector Size: 100 lb/hr @ 58.5 PSI
  • Max Horsepower Rating: 650 Naturally Aspirated
  • Terminator LS Options: Fuel, Spark


Links
Instruction Sheet
Parts Guide
Addendum

Shipping

All in-stock items are shipped on the first available business day. Most orders ship on the same or following business day. 

Out of stock items are shipped as soon as they're available. Many items are built to order. Those items will have an average lead time on the product page. 

All items on our website ship for free. However, a restocking fee equal to the shipping charges incurred by us, the seller will apply to all new condition items returned due to a customer changing their mind. 

High value items will require a signature on delivery for your purchase protection. We will only ship to the verified billing address provided with the order.

Returns

What items are returnable?(eligible for returns)  

  • 30-day return policy, which means you have 30 days after receiving your item to request a return. 
  •  In unused and resellable items, or defective items. 
  •  In the original packaging with all the tags intact. 

What items and exceptions are non-refundable?  

  • Digital Items like Tuning Credits for HP Tuners
  • Gift cards. 
  • Discounted items (if applicable).  

Damage, loss, or theft issues  

  • If the purchased product is faulty, reach out to us within 7 days of the delivered date. 
  • If the purchased product is loss, or theft, Please collect evidence and contact us immediately.  

Refund solutions  

  • Refund to original payment method.
  • Refund to your shopify store credit.

Refund policy

The Tuner Store accepts returns on new products within 30 days from the date of delivery. Items must be received in their original packaging material and in a new status. Used products or customer damaged products will not be accepted. 

The Tuner Store reserves the right to apply a restocking fee to all returns. The purpose of this fee is to recover operational costs related to the purchase and the customer changing their mind.

When returns are the result of the manufacturer defect as determined by The Tuner Store, the return will not be subject to the above restocking fee. 

How soon will I get my refund?  

  • After your return has been processed, you will receive a refund notice from us and it will take an additional 1-3 business days for the refund to be returned to your original payment method. The refund to the store credit is immediate.
  • If more than 5 business days have passed since we’ve approved your return, please contact us at service@tunerstore.com.
Got a question?
EFI Terminator X Stealth GM LS 4150 - Shiny - 24X Crank - 4 Injectors - 650 HP

$2,249.95

  • Curated from trusted manufacturers

    30,000+

    Performance Parts

  • Shipped directly from verified suppliers

    99%

    Order Accuracy

  • Driven by real enthusiasts

    4.9★

    Customer Rating

Get in touch

We're available 24/7 to assist. Just let us know what we can help you with and we'll do our best.

We'll aim to get back to you within 24 hours.