Y-cables.

Autofoam is used to fill hollow bits of your chassis. It doesn't matter if your car is old or new.

Several installers have their own methods to reduce noise. Not all are the same but many are similar. Ask Howiechoo for a quote.

---

Added on December 5, 2011, 7:18 am

Depends. Some aftermarket HUs come with a controller unit that can hook up with your steering control and that'll let it work. Most don't.

Entry level HU can cost 200++ but usually mid-level is recommended RM900 to RM1800. Good component speakers can cost anything between RM500 to RM3000. All depends on what it is you want.

---

Added on December 5, 2011, 7:19 am

Brands are all the same - especially pioneer and alpine, but are good quality and the newer models are pretty much problem free. But they don't sound the same so you'll have to decide on the type of sound you want.

If I'm not mistaken that Pioneer is kinda old.

But for that range - I think they all sound the same. It's up to you which one you want. If you're willing to increase your budget then there's more models you can think about, some will probably sound better too.