OP, you don't NEED an external amp, it is recommended for better performance from your speakers. However you are going to get better quality from your new speakers and head unit then with the stock system. It's basically to be had in steps and stages, options as well. However keep in mind dropping 300+ on a set of speakers and only running them off the 18-22 watts RMS of a head unit is basically chocking their performance.
Last edited by bigaudiofanat; 12-08-2014 at 08:34 PM.
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