Sorry, I was addressing a couple different things.
The concerns I'd have with this N20 system is the plastic lines that run the gas from the passenger compartment to the engine compartment cracking or failing. If they failed you'd certainly have to replace them and in the meantime you'd have no extra go go juice. More importantly to me, you could wind up hitting the button and purging N20 into the drivers zone, and since we all know what laughing gas does to us at the dentist, I'd hate to see what it does to somebody driving down the road. Since it should only enter the air in the passenger compartment while you are pressing the button, the danger would be much lower of being slowly overcome. Another concern of mine would be just how accurate the MAF sensor can read the changes in the air temp when the N20 is spraying, and finally even if the MAF sensor is accurate, I'd be worried about the computer being able to cycle the injectors to spray enough extra fuel (at 100hp kit, that would require about 50% more) than would normally be required solely based on the air being colder.
The next part was dealing with the idea the O2 sensors would be involved in monitoring the rich/lean condition of the motor. If you "floor" your stang after a certain amount of time depending on which computer you have, usually a couple seconds, the computer goes into what is called "open loop." When the car does this it throws the emissions equipment and sensors out the window and reverts to a performance program. The performance program is designed to give you even more hp and tq than what the "closed loop" operation will give, but it's still tuned a little rich just to make sure you don't fry your motor. This N20 system has no pressure built up in the lines from the bottle to the intake duct, so it takes a second for the N20 to even reach the MAF, then it takes another to get into the combustion chamber and burn. By the time everything is working right, the O2 sensors will be ready to kick out during "open loop" running, which means they aren't doing anything to monitor the exhaust anymore.
In the final parts I was addressing the capabilities of the speed density system to use this N20 setup. Carbs can't because they don't really have a sensor to detect and add more fuel based on air temp. The speed density system does read air temp, and because that is considered by the computer, it would have the fundamental ability to use the N20 system. My main concern with the SD system is it's sensor accuracy, and it's response time. Just how fast does it read the change in temps? If the SD sensors are slow, they wouldn't be able to process the air temp dropping from 100* to say -30* in a split second when the N20 is sprayed, and the motor will run super lean and burn down because of that. I just can't imagine Ford would be building programming so extreme that it would react that quick to a change in intake temp on a SD car.
Also, since SD doesn't have a MAF sensor way down the intake duct, the N20 would have to be sprayed much closer to the T/B on a SD car, otherwise the sensors won't be able to read the temp drop quite as well. That's assuming the sensors are capable of responding that quick, and the computer gives the air temp charge a crap of importance in it's running cycles.
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