Best for racers?
Either the HP, the full-featured Dominator, or the Commander 950 race MPFI-all three can easily handle drag racing, road racing, and even off-road and marine applications, and offer control over just about every imaginable parameter including data logging, four-stage nitrous control, and probably a few you haven't considered. All can operate as speed density, Alpha-N, or combination fueling strategies, and Holley's water/meth solenoids are specially calibrated to allow the user to enter water/meth ?ow as a percentage of fuel injector ?ow. A Boost Builder function offers the ability to assist building boost on the line by altering ignition timing, fueling, and nitrous oxide activation. Dominator systems add even more capability such as control over 12 sequentially driven peak-and-hold injector drivers, or up to 24 low- or high-impedance injectors.

What do you get?
With Avenger systems everything is included for install except for a return line to the tank. On the HP systems you will need to select the fuel pump that works with your vehicle, but everything else is included. Dominator systems are built to order, so you need to select all the components separately.

What options are available?
Avenger systems can be upgraded to HP EFI standards, and systems can be purchased with a choice of oxygen sensors. Three versions of four-barrel TBI kits are available: 700 cfm with 65 lb/hr injectors (up to 400 hp), 900 cfm with 75 lb/hr injectors (up to 525 hp), or 900 cfm with 85 lb/hr injectors (up to 600 hp). Dominator ECUs are fully optioned with every control under the sun, but the kits are wide open for custom tailoring.

How do I tune it?
The Avenger kits are intended to not be laptop programmable, since Holley configured it specifically for guys who hate laptops, but you can laptop tune them if you desire. HP, Dominator, and Commander systems are tuned via laptop.

How much?
Avenger systems start at $1,799 for a 670-cfm two-barrel TBI kit. HP systems start at $1,749 for a 900-cfm four-barrel TBI kit. Dominator ECUs go for $1,599, and full kits are ordered piece by piece to suit your needs.

Source:
Holley
270-782-2900
www.Holley.com

Howell Engine Developments
What packages do they offer?
Howell offers full turnkey EFI conversion kits and wiring harnesses that cover the earliest TBI systems to the very latest LS9/LS3 GM GEN III engines.

Easiest kit?
The simplest packages are the TBI kits that are applicable to GM, Ford, Chrysler, AMC, International, and just about any previously carbureted V-8 or V-6.

Best for racers?
Howell doesn't gear their kits for racers since the systems are usually one-offs that require much future tech support, but the system can support high horsepower.

What do you get?
The TBI kits are made up of everything you need to change over a previously carbureted engine (e.g. wiring harness, GM ECM, all sensors, external fuel pump, adapter plate, fuel line, and so on).

What options are available?
Most harnesses and kits are made to a specific application, and Howell doesn't have a generic one-fits-all approach. Options on the various kits range from fully computer controlled timing or vacuum advance type ignition. Howell actually meets emission compliance on several of their kits and harnesses.

How do I tune it?
All kits include a calibration PROM based on the engine specs given. No tuning is needed.

How much?
The price range on the kits is $1,100 to $2,400. The price range on harnesses is $325 to $900.

Source:
Howell Engine Developments
810-765-5100
www.HowellEFI.com

Inglése
What packages do they offer?
In addition to the well-known twin side-draft carb systems that fit right on a standard four-barrel manifold and eight-stack systems using Weber IDA or IDF carbs, Inglése offers fuel-injected versions in the same configuration.