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Well, I described a lot of hardware, but I think what you're looking for is the engine management stuff. Some things to keep in mind:
Dunno where you live, but in any event I think to get the your Euro certified, you will have to show original smog equipment on your car. I do NOT know much about this (although my car is a Euro, the certification was done before me), but I'm not sure how much tweaking you can do with a stock car and still get it over here legally. Once you do get it here, things get easier, but how much easier depends on the state. In Calfornia, there is a visual inspection, as I recall, and some inspectors don't seem to care what it looks like if it sniffs o.k., and some do. There is no visual up here in Washington. The point is that going to an engine management system is going to require changes to the engine compartment that could be picked up, either by the feds or a nosy state inspector.
That said, here's what I know about engine managment systems and their prices. The low end is Electromotive. About $3750, plus installation. Problems: sensitive to cams with significant overlap over stock--that messes with idle control. Idle is a ***** with these things no matter your cam, and the problem is that idle is an important factor with smog tests. In Washington, you can't just drive up to a smog station and have the car pulsing between 900 and 1200 rpm as you get smogged. You'll be flunked, no matter what the sniffer says. Plus, it just pisses youoff too much. Electromotive is well priced, but I would never go with it unless or until I met a wrench who had successfully installed it ON A 930.
I've heard that EFI is the next step up, but don't know anything about it, including its price.
The next step up is Motec. This is what I have. A 32-bit processor, lots of programmability, way more sensors than the lower-priced units, decent idle control, boost control (check out their website, which I don't have right now but I think I found with a search on Yahoo). Used by lots of Porsches at Le Mans. Disadvantage is price, and geekiness needed to program the thing effectively. I got mine done for $8750, but that was because I had patiently waited for Powerhaus/Motorsport Design to install the Electromotive system right, and they couldn't get it to where any of us were satisfied. Full cost installed by someone who knows what he is doing is probably just above $10,000.
The most expensive, and some say best, system is Zytec. Amazing control and monitoring of engine parameters. Disadvantages: probably over $12,000 installed, and the only person in the U.S. who knows how to do this sytem right that I am aware of is Bob Holcombe in Scottsdale. Motec people who know what they are doing are more common.
So there you have it. You get what you pay for, I'm afraid.
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