I also bought a G31 with the basic stereo - no amps, no tweeters, etc. I decided to upgrade all speakers (Focal K2 front door, Focal Inside dash, Steg underseat and rears) and added Match UP 8 DSP. All plug and play, but I still chose pro installation + DSP setup. The costs were not excessive but the result is huge. Can not compare with the previous basic stereo. I can only recommend this + the amp still has one output free for future subwoofer addition.
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