Info:car subwoofer, west coast or soundstream?

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Hey guys,

I'm interesting in buying a subwoofer and put it in my trunk(yes, i will make sure my hockey bag can still fit in :D ).

I'm not interesting in flashing my car, and have the baddest and best looking sub. I just want more bass when i'm listening to my music..(mostly my crunk).It is very important that i keep a good sound quality, because most of the tuner car you heard crossing the street, you can't even heard the vocal, you just heard the bass. so i don't want to show-off.

Do anyone has a friend or know something about these 2 brands?

1-West coast custom by Orion.(Actually this brand replaced the directed extreme series)

2-Soundstream

Or if you have any experience in the domain, maybe you could suggest me one of these 2 brand..

Thanks!