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You will not blow up anything (amp or speakers) replacing your stock speakers with 4 ohm aftermarket speakers.
I can't remember if the Amp in a 2000 Box is a 2 ohm amp or not....I remember the Bose system was a 2 ohm set up but I doubt the stock system is.
Even if your amp is a '2 Ohm' amp, it means that the amp will be stable with 2 ohm loads. Believe it or not (although its true) you could even run 1 ohm speakers at reasonable volume levels without anything bad happening. At higher volume levels, your amp would distort (clip), sound terrible and most likely go into a protection mode.
A 4 ohm load with a two ohm amp is very easy on the amp.....Your amp will run cooler, deliver half the power but will play just as loud for all practical purpose.
Want proof? Think of all the folks on the forums that have replaced their old stock dash speakers with aftermarket Alpine, Hertz, Kicker or other brands that are 4 ohm drivers. They all work and sound much better than stock. No amps were harmed.
Also, remember this....any impedance rating you see on a speaker is a nominal rating and is not constant across the audible frequency spectrum, so a 4 ohm speaker may be a bit higher or lower while listening to music. Don't worry, the amp can handle it.
Now, for anyone going full boat and doing a component system or subs, get the right amp that will run your new system. It'll be worth it!
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