There’s only so much you can expect in a car environment. I used to build SQ systems in cars and compete. The only way you can get anything close to what you would at home is with a full interior rebuild, DSP and, being stationary. If you’ve swapped the factory speakers and amps, added a dedicated sub and, added a ton of sound dampening material you’ve gotten 90% of what’s possible. DSP is also good if you only care about what it sounds like in your seat and nowhere else. The last 10% is ridiculous in terms of price, time and, usability.