Holley Sniper Stealth 4500 EFI

What could be better than having a sniper on your engine? A bigger Sniper of course!
Check out the Sniper’s Stealth 4500 EFI System! It’s based on the same great design as its little brother but features the larger Dominator style main body with its 4 Bolt Air Cleaner Flange and can flow a massive 1440cfms! The massive -8 fuel inlets help feed the 8) 100 pound per hour fuel injectors which can easily support 800 to as much as 1500 HP when naturally aspirated or up to 1250 HP when used on forced induction applications. An external pressure regulator is required with this set-up in order to maintain proper fuel pressure.

Subscribe now to make sure you don't miss any of our new products!

HOLLEY ON SOCIAL:

[johnparrish]

Years ago when I was into Tractor Pulls, I could have used a pair of these on an Allison V12 since the old carbs were nothing but trouble.

[shenanigans]

Hey Holley, what’s the standard throttle blade setting on the sniper 4500. It has two screws so should they be adjusted evenly? How many turns past contact is a good starting point ?

[wicked]

I bought one of these back in August. Its been on my car now for 6 months and I have had nothing but problems trying to set this up. I have been on the phone with Holley at least 20 times. Had to send it back once because ECU was bad. I also added the digital dash. What a nightmare that was to set up and still is with the sensors for oil and fuel and fuel gauge!! I still don't have the car running right after Holley even provided me with one of their custom tunes. Each day I start the car it seems to run different with idling problems, surging, etc.. motor is a 800 hp 440 SBC with race cam. Cant seem to get it right and finally gave up. Holley was awesome with the tech support, I give them 2 thumbs up for that. They even told me that at this point I need to take it to a professional tuner. But man I am sick of working on this damn thing. Trying to get a refund but not holding my breath. I really don't understand why its not working right for me but hopefully someone else has better luck. And I am not a novice mechanic. I built my motor myself and have ran carbs for years with no issues. Thought it would be nice to have EFI but man what a nightmare getting this set up. lots of issues. Im going back to Carb!! but man I really wanted EFI!!!

[montycrain]

Any chance for a stealth 4500 with a Terminator X ecu with flex fuel capability in the future ?

[darrin]

any plans for an efi system that can run alcohol based fuels like e85 or methanol?

[drflex]

you should split this in half and configure it to fit on a 671 similar to an hilborn 4 port

[stoneyswolf]

Let's see what tax time does for me I like it. Wonder if it supports timing control.

[chadb]

Please tell me you guys have a program in the works that will allow me to activate a datalog via tps that can be viewed via laptop. Like on the terminator and up?

[donscheeres]

Very Cool.... would be good to see the stealth sniper look in a lower hp model.

[tspecht]

How is this capable of 250 lb. less horsepower on turbo applications compared to normally aspirated? This doesn't really make sense when comparing to the 4150. It is capable of 600 NA and 650 boosted. Wouldn't this be capable of more boosted than NA?

Does anyone know of a solution that is capable of handling twin 74mm turbos on a 427 windsor?

[mallanac]

Have you managed to solve your problem with the EFIs not working with dual plane intake manifolds?