In reply to Opti :
The snipers and stealths iirc are mounted at the throttle body. It depends on what setup you are looking at, as far as where the ecms are mounted, but im pretty sure both those lines are throttle body mounted ECM.
It's also one of the worst setups I've ever dealt with as far as potential for emi / rf feedback causing the ecm to go haywire. Its garbage and i would highly recommend you stay away. We have played with a bunch.. they are not worth the hassle. Their regular stuff that isn't cased on the throttle body is no issue. Some of them will be zero issues whatsoever...some will be solved by throwing it in the trash and bolting on another unit after hours and hours and hours of trouble shooting. And the problem just magically goes away with changing *nothing* other than the unit itself. Swap the other bad unit back on. Problem comes back. And I'm not kidding either. I've seen it, multiple times.
A couple years ago, I swapped a MSD Atomic 2 EFI and Holley Hyperspark ignition onto the stock 318 in my 1979 Dodge Power Wagon to replace the old 2bbl Carter BBD carb setup and the ancient Chrysler ignition system. This is very similar to the Holley Sniper, but features a fuel return, external fuel pressure regulator, and a different injector setup. Wiring it to the old harness wasn't bad, and getting everything working as it should once I had a decent tune loaded into it.
When I blew that engine up (completely unrelated to EFI), I swapped in a Magnum 360. I considered using the OEM Magnum MPFI setup, which I still have, but ended up using the Atomic 2 again due to ease of installation and familiarity with the setup. While TBI is not as efficient, it's nice and dumb in all the places you need it to be and I have more control and visibility into what it's doing thanks to the Sniper tuning software and the handheld screen/touch interface. It's been running well for nearly a year without me having to do much. I adjusted a tune once a few months back and that's basically it.
Carl Heideman said:
In reply to Shavarsh :
I'm afraid the answer is buy a whole spare Sniper. I've had little luck finding individual components as well. I've been planning to call Holley tech support and try to chase down how to put together a spares kit. That's how I've slowly been figuring out how to source connectors to reterminate the wiring.
This makes me think of my other concern with Snipers or aftermarket EFIs. I imagine they have a life of around 10 years and if they last that long, parts and tech support will be no longer available. and it will be time to buy a new EFI with whatever is current.
Aren't they all Metripak connectors? Or am I thinking of something else...
I have had two occasions where I needed an old DOS-only laptop to work with Accel DFI. And once there was a Buick with some really esoteric tunable ROM emulator thing on the stock ECU ('727?) that the owner just supplied his laptop with the car... we're talking first generation laptop three inches thick with an 8"x3" LCD screen 
In reply to Pete. (l33t FS) :
They are Delphi metripak connectors. The other thing that helps on those piles of garbage is taking ALL the excess you can out-of the harnesses. Like the crank trigger for instance. It's unnecessarily long. And remove unused wires as well. There's a ton you can do, to hedge your bets for success... but sometimes you still just have a junk unit. It's a shielding problem on their end. Not all of them exhibit the problems, but enough do to where it's a known issue. They're good about sending out replacement units, but it IS a hassle.
