How do I add another set of speakers to my car?

Please rate my car sound system! What should I add or change if anything?

• Rate my car audio set up.  What do you think of this setup? Should I add or replace anything? What do you think of it? 1-10? --------------------------------- Front door: Pioneer TS-A6874R 6"x8" 3-way car speakers Design 3-way Tweeter Design 3/8" Dome Tweeter Composition PET Woofer Composition IMPP Woofer Surround Elastic polymer Sensitivity 90 dB at 1 watt  Frequency Response 30 - 30k Hz RMS Power Range (Watts) 2-40 Peak Power Handling (Watts) 350 Impedance (Ohms) 4 ------------------------------- Sub: Alpine SWE-1243 Type-E 12" single 4-ohm Size 12 -inch Impedance 4 ohms Cone Material Fiber/Kevlar Pulp Surround Material Santoprene Rubber Ideal Sealed Box Volume (cubic feet) 1.25 Ideal Ported Box Volume (cubic feet) 1.74 Free-Air No Dual Voice Coil No Sensitivity 86 dB at 1 watt Frequency Response 27 - 1000 Hz RMS Power Range (Watts) 100-250 Peak Power Handling (Watts) 700 Vas (liters) 65 Fs (Hz) 29 Qts 0.62 Xmax (millimeters) 11.7 --------------------------------- Amp: Alpine KTP-445 RMS Power Output (Watts x Channels) 45 x 4 Minimum Impedance Unbridged 4 Best Frequency Response 20-20k Hz THD at Rated RMS Power 1% Amplifier Class D Bass Boost No Bass Boost Frequency N/A Fan Cooled No Fuse Rating 15

• Answer:

  well i think you should add more bass, thats just my personal preference because i like to feel myself going down the road lol, aftermarket head would be nice some more small speakers, maybe 5.25 or some small subs, and definitely get some sound deadening material, because the sounds should not be rattling your body panels