Well it was just something I picked up for 75 so I just dawged it all amps will run fine if you run the correct impedance and some well built good quality amps will run below impedance just depends what you grab and how much research you find on it as well as how good your electrical is , as far as telling you what to grab idk because everyone has their own preferances , music choice , spl sq sql , what type of car , how much space in the trunk you have and what size alt and kind of battery you have all become factors when upgrading you would have to give us more info in all categories to point you in the right direction as well as what is you budget for what your looking for first step id say is getting rid of your current setup to line your pockets thats a good start
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Knukonceptz has great true gauge kits for a great price