How to modify 06 Murano?

[hujirong]

Hi

There are at least a couple of things I want to improve for my 06 model (brought in 08) black Murano.
1. Handling is the major problem. I found this car is not stable on highway. Not stable I mean I feel it's wiggling and not stick on the road even comparing to an old Dorge VAN. And I found this post. Can I follow this to fix it? Is there any other way to quickly improve it?
suspension-fix-for-2007-murano-t479225.html

2. And if possible, I want to lower it a bit since we drive on paved road all the time. Where can I get the aftermarket parts?

3. My tires are almost wared after 60km. I want upsize the rim and tires.

4. HID, where can I get it?

5. The steering wheel is too heavy. How can I make it lighter?

6. Wind noisy on highway. I guess there is not much we can do with this.

Is there anything esle I can do with this car to make it better? I brought it because I love its appearance.

I have a 06 Mustang GT Conv, so I know a little bit of modifications.

Thanks
Jirong