Reading between the lines, if you are asking whether the electrical system can handle the 250W aftermarket amp, the answer is absolutely. I'm running close to 750 watts in my 300c and haven't done any electrical upgrades. Obviously, use the appropriate guage cables required by your amp's manual. You may find that your dash and headlights dim when the bass hits. Many members have installed capacitors to help with this.
Your direct question about whether your aftermarket amp will draw the same power is hard to say without testing. My guess is that it will draw more. BUT, I have a fairly high confidence that after installing your aftermarket 250 watts, you'll be questioning whether the factory is counting by two's when rating their amp as 250+ watts.
Jason D
2007 Jeep Grand Cherokee SRT8
1965 Lincoln Continental Convertible
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