The more powerful the amp the better. If you are not going to change the HU make sure the amp you go with has an variable crossover. Some amps have just the high/low/full settings but you will still get some noticeable distortion. The settings are too generic. A variable crossover will let you fine tune the sound more exact. I have the Arc Audio 125 and it worked great with the stock HU running some alpine speakers. I've changed the radio not too long ago and it sounds even better.
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V&H Exhaust//Stage 1 intake//6k HIDS//12" KW Flare//12" Buky Assaults// Arc Audio 125.2// Alpine 5 1/4 components// Alpine head unit//color matched gauges//chrome this chrome that