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Description
Holley EFI Terminator X Stealth GM LS 4150 - Shiny 550-102024X Crank 4 Injectors 650 HP 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
24X Crank - 4 Injectors - 650 HP
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!
- 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
Specs:
| Accelerometer Support | Yes |
|---|---|
| Boost Control | Yes |
| Brand | Holley EFI |
| CAN-BUS Support | Yes |
| CFM | 950 |
| Coil Per Cylinder Ignition Support | Yes |
| Color | Shiny |
| Crank Reluctor | 24x |
| Datalogging Support | Yes |
| Distributor Included | No |
| Dry Nitrous Control | Yes |
| e85 Support | No |
| EGT Support | Yes |
| Emission Code | 3 |
| Finish | Shiny |
| Flange Size | 4150 |
| Flange Style | Squarebore |
| Forced Induction Support | Yes |
| Fuel Filter Included | No |
| Fuel Hose Included | No |
| Fuel Injectors Included | Yes |
| Fuel Pressure | 58.5 PSI |
| Fuel Pressure Regulator Included | No |
| Grade Type | Performance |
| Handheld Included | Yes |
| Ignition Timing Control | Yes |
| Ignition Type | GM LS 24x |
| Individual Cylinder Fuel Corrections | No |
| Injector Size | 100 lb/hr @ 58.5 PSI |
| Inlet / Outlet Size | 6AN |
| Intake Manifold Included | No |
| Knock Retard Support | Yes |
| MAP Sensor | 1bar |
| Max Horsepower Rating | 650 |
| Multi-Stage Nitrous Control | Yes |
| Product Type | EFI System |
| Progressive Nitrous Control | Yes |
| Self-Tuning | Yes |
| Terminator LS Options | Fuel, Spark |
| Throttle Bore | 1.75 in. |
| Throttle Position Sensor Included | Yes |
| Transmission | N/A |
| User-Tuneable | Yes |
| Warning | California Proposition 65 |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Does a great job!
I gave it as part of a gift to my son and he loves it. It’s used every week and does a great job.
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Reviewed in the United States on May 24, 2026
★★★★★ 4
It’s fine.
I would prefer the needles be straight, and I couldn’t make them that way. The method for replacing the needles is … fine. I would also prefer the base of the holder be closed rather than open. It works well, but didn’t meet my expectations.
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Elegant! 👍👍
I didnt just want a WDT tool. They basically all do the same job. I wanted something that was elegant and beautiful to look at. This is it!
No plastic here. The base is solid metal and thick heavy at the bottom so as to not get knocked over. Top is a real nice smooth wood.
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Reviewed in the United States on April 9, 2026
★★★★★ 5
Wonderful WDT
I was not convinced this WDT would make much of a difference but it does. It is easy to declump espresso clumps. It is nice having the clever stand to store it in.
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Reviewed in the United States on January 25, 2026
★★★★★ 5
Looks great - Heavy base - Solid beautiful walnut handle - Replacement wires
This is a really nice looking wire distribution tool for espresso portafilter baskets. The base is a very handsome shaped solid aluminum that has a good amount of heft to it, so it won't easily get knocked over. And it's perfectly aligned with the ascetics of the solid walnut handle that makes this look great. The walnut handle, from what you can see in the photos, is made from about 7 to 8 laminated pieces of walnut; it's not just an end cap or veneer. It may not be a single piece of walnut, but it would be dimensionally stable and less prone to crack over time..
This distribution tool has 7 stainless steel needles that helps to break up clumps (see photos). I found it done a pretty great job but for the sake of preventing a mess, I found it was easier to stab the grinds from the top, and then produce a small tight circle, which I repeated a few times. I felt that if I were to just stir the fine grinds in big circles, it would have knocked a lot of them out of the basket. I'm sure with more usage, I would perfect the technique with far less mess. I later realized later that a dosing funnel would actually be very useful in preventing any mess and it would help keep the grinds in place (see comments below).
This set comes with an additional 7 needles, but as you can see in the photos, I left them in the packaging and did not get them out. I was curious how they were held in place in the handle, so foolishly I tried to remove the plug with my fingers and they slipped and I wound up pinching the needles. This happened before I took the photos, which explains why they are not perfectly straight and parallel to each other. I found this to be somewhat disappointing because they looked really awesome how perfectly aligned they were before I bent a few of them trying to remove the base.
My point of this warning is that the needles do bend if forced, so be careful with them. That is why I did not want to remove the replacements. To be clear, these are stainless steel needles that have a great deal of flexibility to them, and they do not easily bend, but they are also difficult to get perfectly straight again. My error was that when I was trying to remove the base, the pinching grip I was using bent a few of the needles when my fingers slipped off the base.
The base of the handle, in which needles are set, is friction set in to the handle. I was not able to remove it by using my fingers since it is that well secured. It looks and feels like aluminum which matches the base. My suggestion on removal of the plug, is to use pliers that are wrapped with a generous layer of tape to protect the finish of the aluminum plug.
Overall, I think this is a really attractive set. The handle really looks warm and rich in the natural tones and grains of the walnut. It is perfectly paired with a strikingly handsome aluminum base that has a good amount of weight to it so it won't easily fall over if slightly brushed. The needles do retain a residue of grinds, as you can see in my photos, but it's not much. But the base, being hollow allows them to fall through to the counter top so they won't collect in blind hole. The hollow design of the base also allows it to be easily cleaned too. The needles are nice and long, and effective, but I foolishly bent a few on accident and I ruined the charm of how they looked when they were all perfectly parallel to each other.
I'm on the fence as to if this really makes a better espresso. It does eliminate lumps and evens out the grinds as it's designed to do. I usually use 14.0 grams of grinds in my portafilter, but to prevent a mess with stirring the grinds with this tool, I went with 11.1 grams, which was not enough to build up any pressure in my espresso machine. I realize with more use, I will get better and more comfortable with increasing the amount of grinds. I also just noticed that I could really benefit from using a dosing funnel while using this needle distribution tool, and would eliminate most of the mess. Coffee is always a fun adventure, and with this tool set, I've opened a new door to explore, but I think I really need a dosing funnel to do this one better.
I love the way this looks, and it really fits in with almost any setup with it's design, shape, and colors. This would be an excellent gift for any espresso lover out there, even someone who may not be so fanatical with the process. If you are thinking about gifting this to someone special, and you also happen to know what size their portafilter is (the diameter), then I strongly suggest getting a dosing funnel too so their first use is far more successful and pleasant than what mine was. The better their first impression may be, the more likely they will fall in love with this and want to keep exploring the possibilities.
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Reviewed in the United States on December 6, 2025