How to put subwoofers in a car?

Ok listen and listen carefully. When you install equipment like this where you introduce new, powerful electrical equipment to the mediocre electrics on a car. you can get problems if you have no idea what your doing. And no offence but to me who has been doing this a long time, you sound like you think a sub could be powered by a HU. Thats why there is professionals that do this stuff. Go to a shop and tell them you want a good system and tell them your budget. In less then a week you'll have a new stereo instead of trying to do a first time install on a foreign car. There is soooooo much stuff that goes into making a system look and sound good I promise you, you dont want to waste your time learning the ropes. Just let a pro do it for you.