You can get a system to hammer............... for not a ton of money. It's all about the effiiciency of the drivers and a good install. Makes me laugh when guys buy 10,000 watt amps to driver their piece of shit massive in-efficient subs for a daily driver. Only people winning that game are the stores selling the gear to you for a shit-load of money.
Current : 2013 Mini Countryman JCW
Past: '88 E30 M3, '69 BMW 2002 Ti, 2000 328i, Audi A6 TT, BMW X5 3.0i , Audi A4, Mini Cooper Clubman S 1.8T