Installing a sub an amp ?

[KKK VR6]

Just though I'd make a thread as I couldn't find one.
My friend bought a subwoofer and a amplifier, but im wondering if it is really as simple as wiring it in as you would, in other cars, or are there codes that need to be delt with ?

Any help with this would greatly be appreciated especially if you have or know someone who has installed either 1 or both of those things.

Thanks
Kay

Just forgot its a 90tsi
Also sorry if it's a dum question, but I come from a older generation golf

[LunchboxVRS]

If its just factory stereo and a of the shelf amp then it will need to have a line in connection or you will need to get a Line out to RCA converter as the factory stereo has no RCA outputs

Do a search and look in the audio section for more info.

[Pullstarter]

The factory deck also has no remote power wire for the amp either. I used the power wire from the ciggie lighter to make it turn on but remember to put an inline on/off switch in too other wise the amp will always be running whether the deck is on or off.

[LunchboxVRS]

The deck should have two power wires running to it. one is constant and the other will be +12v with ignition on. Use the later to tap In for the amp remote wire that way you won't need a Switch. If you can get hold of a multimeter to check which has voltage when ignition of and what has volts itch ignition on. Or get hold of the wiring diagram..