I like to hear low bass on stock radio. If I have cargo cover and I put 2 good speakers on how can I connect them with existing wiring ? Any body have ideas ? welcome to all solutions.

 

I don't know about putting speakers in the cargo cover, but I'm planning on having a single 10" sub in a small enclosure installed in the hatch area on one side in mine. From what I've seen it should run me about $400 installed.
If you're more of a do it your selfer you could install a powered subwoofer like one of the Infinity Baselinks or Bazooka tubes. Here are a few examples of ones I've seen:

Infinity BassLink Powered subwoofer: 200 watts and a 10" sub at Crutchfield.com

Bazooka BTA850FH 50-watt powered 8" Bass Tubes enclosure® with included factory radio connection kit at Crutchfield.com

 

what i plan to do, is install a factory sound processor to clean up and imrpove the oem stereo's sound. read up on them:

What are Factory Sound Processors?

you could then wire your oem speakers plus additional speakers directly to the sound processor, or wire your speakers to an amp, and the amp to the sound processor. You get aftermarket stereo quality sound without messing with your oem stereo.

crutchfield sells them a bit expensive, i'm sure you could find a deal on a used one online. try craigslist or ebay. or see if you can find a sale at bestbuy or something like that.