Tara (and probably others) offer some expensive, high end guitar cables. Several hundred dollars.
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I've been using a Tara Labs Decade cable for my Fodera bass for about five years now with great results. Improved frequency response across the entire spectrum. A much more punchy sound.
Audience also makes a line of MI cables you should check out. I have one of those too. Not as full sounding as the Tara, but might work really well for guitar.