Hi Nozila
I have installed a carputer into my R32 GTSt 4 door.
My system is an 8" Lilliput touch screen and a P3 1.8GHz computer with 512mb of RAM and a 80gb hard drive in a custom computer case in the boot. This is connected to an amp and a 12" sub. I have 6x9's in the back and 6's in the front. I'm also running a USB 7 port hub and a Powermate control knob (for volume). The computer is powered with a custom built power supply with an in-built startup/shutdown controller, mounted in the case. I am running Windows XP as the OS and using the FrodoPlayer frontend to play media. I use it mostly for music, though I have a few movies on my computer too, and I can play GTA 3. My computer is fairly basic and is not set up for complex 3D gaming or any muck like that.
Here's a rough cost break down for the computer components (not including amp, speakers and sub):
Motherboard: $75
Hard drive: $75
RAM: $60
Case: Custom with 2 case fans (no cost available)
Touchscreen: $450
Powermate: $60
12vDC powersupply: $130 to build, had to buy circuit diagram & board and components individually.
USB hub: $40
Now, your wireless internet is a different story. If you mean wireless access to the net as you drive, this would mean using a mobile phone as a modem or getting a sattelite plan connection. Both of which are very expensive, so I haven't bothered with them. However, I do plan on putting a wireless network card USB into the computer so that I can tap into any existing WiFi networks wherever I park the car (and it helps when you put media in the car)
I haven't done GPS, as you have to buy a GPS reciever and an antenna, and software if you don't want to go open source.
You can also do XM radio (with a special reciever) which is a sattelite radio band available in most of the world with hundreds of channels. You can also get HD TV tuner and and antenna so that you can watch TV in the car as well.
I heavily used mp3car.com as suggested by another member which supplied me with most of the info regarding the power supply and the startup/shutdown controller which is the most complicated part of the whole system.
If you have any more questions, feel free to leave a message here or PM. I've only signed up here to post this (at this stage) so I may be a while in responding.
