I need advice from the car audio people. Im trying to get a system put together for inexpensive, really inexpensive. I just brought the BMW outright, and had to drop about 1200 into the engine.I dont want anything thats going to raddle my trunk.... My first plan was to get a Bazooka Tube from Best buy for 220. But then i thought about it and decided i would probably get better sound if i just did component. So this is what i Put together for 250$ Before install.

Pioneer 10" Subwoofer, TS-W253R

http://www.crutchfield.com/p_070XPA2500/Dual-XPA2500.html?tp=115

http://www.bestbuy.com/site/Atrend+-+10%22+Single+Ported+Subwoofer+Enclosure+-+Charcoal/9027037.p?id=1218009784482&skuId=9027037

Basicly a 300 watt Dual Amp
10 inch pioneer Sub
with 10 gauge speakerwire
and a Attend box ( Best buy brand exclosure ) which has decent reviews

Will this sound decent? In a 1999 BMW 540i! Thanks for the advice. PS everything is still in the box, i go in for installation 2pm tommorow.
And iam leaving the factory head unit . THX