Hemi wrote
1. Do i have to upgrade my cars electrical system to install the sub's and an amp?

Short answer, No. Unless you plan on running a big setup (something around 2x15" 6+ 6x9's)

Hemi wrote
2. How would i choose an amp that is compatible with your subs?

Any decent brand amp over say 1000watt should be fully capable. If you are running speakers off of it as well as the sub/s then you might want to go higher.

Hemi wrote
3. Do i need a capacitor/isolator or a second battery to my car?

My question: Do you have a volt gauge in your car? If you do then see how much the volts drop with the subs in vs subs out. If their is a big difference (0.5v ~ 1v) then i would recommend a capacitor.

If you dont have a volt gauge then wait until night time with the sounds installed, park up against a big flat wall with your headlights on full, play a really 'bassy' song with the sub on full and see if the headlights dim at all.

If there is a noticeable difference when the sub is in then putting in a capacitor is a good option, and not very difficult either.

Hemi wrote
4. Also would these kits work good?

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Those kits would work, but they wouldnt sound very good at all. I am speaking from experience as I have worked at an Auto Electrician installing mainly sound systems for all types of cars.

Best brand in my opinion: Kicker.

In my car i have 2x12" kicker bass station subs powered by a pioneer 1200w amp, which also have 2 6x9's coming off it also.

If you need any more info go ahead and ask me here in the comments or send me a PM

1. Do i have to upgrade my cars electrical system to install the sub's and an amp? Not at all if set up correctly

2. How would i choose an amp that is compatible with your subs? Check the wattage of the subs you want to get. If you get say 2 600 watt subwoofers it would be 1200 watts combined and you obviously cannot run them off an amp lower than 1200 watts.

3. Do i need a capacitor/isolator or a second battery to my car? No you do not if you buy an amp installation kit the power cable with come with a fuse already in the line and all will be good.