Well, hey... I mean there is nothing stopping you from trying an 80-way cable and seeing if it makes a difference stability wise. It never has for me, but you may be lucky. That's what it is all about: Experimentation
But transfer wise: no. ATA-33 is about all you are ever going to get.
Just remember though that you will have to "unplug" the blocked up pin on the cable as the IDE connector on the TiVo has ALL the pins present, and not with the missing one around the middle (or thereabouts).
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