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In my opinion, unless the stand alone you're contemplating, does a fantastic job of intuitively figuring out its own map, with closed loop capability, tackles related timing issues without much of a hitch, uses an IAT sensor, and features knock sensing capabilities, I would go with the 8 injector setup.
To me, that's the way to go since it will retain and incorporate, to at least some degree, all of the above features. Additionally, it's much cheaper, and you don't have to go to any of the off-boost tuning issues. You're ready to roll right away, and your mileage won't suffer at all, so long as you're not gunning it.
Therefore, if you're not willing to spend the big bucks on a serious standalone (one that incorporates all of the above features) and also go to the trouble and relative danger of the necessary setup and tuning, I recommend 8 injectors.
Cost of Standalone is about $1200-$2500. Sensors may not be included as well as dyno tuning time and injectors. That could be an additional $400-$500. I'm talking serious injectors too, 550cc and up.
Cost of EIC is about $250. Injectors needed to supplement can be about $100-150 or less if you just go with 4 extra stockers. Bungs are $40. And custom welding work about $50-100, if you choose not to use epoxy.
I didn't add anything like return fuel lines or FPR's, since they're necessary for both. Just think about it.
_____________________________________ Jason ESi-T
04' BMW 325Ci 91' Nissan 240SX 98' Eagle Talon ESi (sold)
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