[Accord Man]

Dear Modest Moderator,

The subs you mentionned are probably the 12W3 (250w rms).
Those are great, but if you want them to slam, you need to go with a ported box.

For the front you could use 6 1/2, even if ya had 5 1/4 stock speakers. You'll be using components right? Its worth the extra cheddar! But for the rear beware, If you drive a sedan, then you have 6 x 9s, otherwise you have 6 1/2s.. You could cut out the right size, but I dont really sugges it. You'll fine sticking with the 6 1/2s.

For powering the subs, 400-500 watts would be safe. If ported, dont forget the subsonic filter.

I suggest a 1 or 1.5 farad cap, just to protect your electrical system.

Dynamat, you put whevever you need. You're not competeing right?? So just put it where the car rattles, or lets too much noise pass. I wouldnt do the entire car, cause thats a lot of weight!!