bro.. your question is too damn vague.. we need more info.

What's your budget, do you want BOOOM BOOOM SPL or exquisite SQ in your sound system, do you wanna do major modification to your car with kicks, pods, custom trunk ..

Do you want a better frontstage, some rear fill and single woofer?
Or all around good quality coax's and single woofer
Or all out front stage, no rear fill and crazy bass.. etc..

Who will install this?

How many woofer's do you want in your trunk, will you be creating a sub box or buying pre fab.

Answer these questions and then we can start building you a system close to your budget.. otherwise.. it's like asking what's the best looking girl on the net.... :slap: