It almost sounds like you are being sarcastic, but I will reply wiht a serious answer none the less.
1). A Cold Air Intake will not damage electronics (unless it is built incorrectly, in which case the MAF might get damaged). The damage may come from the filter being submerged in water and sucking it up. This is still a very rare occurrence, and a little caution on the roads will stop you from driving through lake deep puddles.
2). If you lower your car, you will degrade the ride. There is no further explanation needed, but I will give one. By lowering your car, whether it be coilovers or just springs, you are changing the dynamics of the suspension, which was built for a purpose. Now, there is a way to change the height of your car without changing springs and the dynamics of the suspension, but it is not yet available for the G25, and I would be very surprised if it ever did become available. The best thing I can say is springs that are 1.5" or less of a drop, such as Eibach Pro Kits, will not adversely effect your suspension and the ride will not be compromised too much. Any further of a drop and new shocks/struts are suggested, in which case a full coilover setup with threaded shock bodies would be more suited.
3). In most cases ricey is objective, and your idea of rice may not be the same as mine. If you are talking about that buzzing raspy sound that so many 4cylinder engines make with these untuned inexpensive mufflers, then it would depend on your choice of exhaust. It all comes down to what you are trying to achieve. If you are trying to free up some ponies, then find the one that does that and deal with whatever sound it may have. Often a full free flowing exhaust will have a much more raspy note to it, and a simple inline resonator will remove much of that sound, leaving you with the deep throaty sound that we all desire.
I hope my explaination was detailed enough for you[

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2000 Civic SiR | Vogue Silver Metallic | ITR Leather | RH EVO C2's | VTEC