How much is too much? (install question)

8 gauge probably if this is for your comp amp

Kits are a bit overpriced (unless you do an Ebay thing, and even then you aren't sure what the wire REALLY will be...) (But NM i read that you are doing Knu)

What I would suggest is for you to get a single run of cable to power both your current amps and any future amps you might want to add.

What amps are you going to eventually run?

Did you say your running 2 amps? You def. want no less than 4 guage. Also look to see if you can find an amp kit with a power dist. block if you are running 2.

There is no such thing as overkill when it comes to power wire size. If you plan to upgrade down the road with more power, and you're not sure how much power you'll be going to, go with the biggest wire possible from the beginning. 1/0 would be my choice. If you look around on eBay you can get power wire pretty cheap.

1/0 would be my choice as well.

NG

4ga is plenty,but 0 ga gives you room to grow

I recommend spending some good money on RCAs rather than the probability of hunting down noises that are simply associated to crappy cheap signal cables. Triple shielded versions and some with the separate grounding lines that run along the tubing with the RCAs like the highest series from Monster Cable, not sure if they make them anymore or not. You can also get 8 conductor single sheath wire from parts express and use it as a long High Level from the head unit to the amplifiers and put a converter on them at the end. That would take care of your highs. Just run an RCA jumper from the output of your highs amp to the input of your sub amp and voila!

Probably closer to 15 or 17 depending on where your amps will sit, or the battery is

How much power wire and remote turn-on wire should I get? 12 feet?

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I used over 15' in my Neon. 17' RCAs were just long enough. Buy a longer length than you need and cut it to length (leaving about an extra foot or two in case you want/need to make a change later). You don't want to try to splice 1/0 to add more length...

As far as RCAs go, avoid the super cheap Wally World unshielded cables, but there is no reason whatsoever to even think about spending more that $20-25 per cable. I use the Stinger Bullet series myself, and noise is not an issue. Unless you have done something wrong or have a bad component in the signal chain, you will not have noise in a system and I do not know of a single instance where swapping a basic shielded RCA that wasn't damaged for a high dollar gucci cable that costs a ton to pay for its marketing has solved a noise problem in a system. High-end cables are kinda like a ROLEX in my eyes. They look nice and are basically a status symbol. You are not getting any more function for the money than my $30 Timex. If you MUST have the high $ cables, go ahead and go completely stupid and wire the whole car with Kimber pure silver litz speaker wire and get the little rubber feet for your amps to keep the fidelity of the transistors from getting affected by the vibration and get a wooden volume knob because the metal to metal vibration of the stock knob introduces spurrious sound into the signal chain. It's your money, if you want to waste it go ahead. The money would be better spent IMO on higher quality amps and speakers.