For the most bang-for-your-buck, easy to put in and take out later, the Bimmertech amp/DSP can't be beat. Buying an HK amp would be just as expensive and wouldn't be as good (and the HK amp with the Hifi speakers is not a plug-and-play upgrade...your HiFi speakers are 4-ohm and the HK amp won't like them). The HiFi speakers aren't bad once they have a decent amp behind them.
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