Firstly, how can you drift in a AWD car?
Secondly, subs, amps and speakers will add extra weight to the car, making it harder to get "plenty of power to the line when I want..."
Thirdly, I recommend getting a really really big wing bolted ontop of the stock wing. This will give your car added downforce, and will therefore make it really fast and will also enhance the acoustics of the stereo. It will also look really bling, and help get sex from a chick who likes your car more than she likes your personality.
Next, get some Mugen and Type R stickers. They will add at least 30kW at the wheels.
What's that odour coming out of your exhaust? Smells like rice