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I was going to say roughly the same thing about the battery. If the battery is in good shape and charging normally, that's pretty much all the stabilization the electrical system needs.
Not only that, but if you have a Scan Gauge or an aftermarket volt meter (that doesn't have built-in suppression), heck, even a simple digital multimeter, you can see how steady the voltage is while the car is running, especially at speed and after the alternator is up to full working temp.
The only component that would need any kind of filtration would be the ECU, but the ECU already has sufficient filtration built in, hence no need for such nonsense as the "anal probe" that the Fuel Doc is ripping people off with.
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