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Not sure what you mean by "power cables" in this context?
I drove a friend's 3.8 JK, since you mentioned the pedal modifier, the impression I got when driving it was the OEM throttle curve was very lethargic. Would drive me absolutely nuts if I owned it.
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The cables from the battery to the fuse block, battery to the starter, alternator to battery, replacement fusible link, engine to frame ground, battery negative to body ground. I also added an alternator ground o battery negative, and a couple short pieces to run dual batteries in parallel.
The OEM wiring is 10ga, the new cables I put in were 1/0, probably overkill but it wasn't that much more than 2ga, and still cheaper than the OEM harness.
If I knew how much better that the Jeep would run afterwards, I'd have done it a lot sooner, rather than waiting for the alternator to go out and start zorching all the ground switched electronics.