If all 4 speakers sound the same, odds are very good that the speaker wire is not the problem. If you have your heart set on new wires, run them to the closest speaker first and see if it does what you hope it will. I think you'll find no discernible difference between the 17 year old wires and the finest speaker wires money can buy. Audio frequency electrical signals are not exactly a challenge to transport...
Tinny sound is most often caused by settings in the head unit or improper speaker mounting. If you have played with bass, treble, loudness etc and cannot get the sound you want, the problem may be a lack of enclosure for the speakers. Are they mounted to an enclosed structure or are they open to the cockpit on both sides of the speaker cone? If open on both sides or the enclosure behind them is too big or too small, they will not be able to reproduce bass very effectively. You can fix this by making a properly-sized enclosure for each speaker or by adding a subwoofer and setting the head unit up to send everything below 150 or 100 hertz to the sub rather than the new speakers you just put in.
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