ok cool, do you believe it will sound pretty good with better speakers? Any technical specs I should be looking for in speakers to match my head units, ohms, etc...

How about these polk speakers?, will these make things sound better?

Polk Audio db6501 6-1/2" component speaker system at Crutchfield.com

As long as the speakers are a 4 ohm load you will be fine and most are. The one thing you should look at is the efficiency the higher the db's the louder the speaker will be and the more efficient it will be with the power you give it. But also keep in mind bigger speakers require more power still because of the bigger drivers on the speakers. It is sort of a +/- thing. They will sound better than your factory ones, although not sure with a stock head unit in a z never tried. But still will be better.

Those will work fine.

I don't have the stock head unit, I have a kenwood dnx-5120. Will I need the speaker spacers?

Yes you will.

K cool, I guess that anwsers all my questions, lol I plan on also putting dyno-mat in the doors to make it sound better, good idea?

Yes just make sure to not cover the drainage holes in the bottom of the doors. It can get messy.

Thanks for all the info guys and info on the speakers.

Not to get off topic of the thread, since it was about speaker spacers LOL

Zenclosures sounds like the place to go :)

Cheers

Ya the ones at zenclosures are like $20, they are def a good deal.

I just ordered the Polk db6501's myself.
Gonna have them running off a Rockford Fosgate Punch P400-2 amp.
I'm really interested to see how much better it will sound.

Make sure to turn that gain down on that amp a bit.

Hey Big got a question for you. Where do you recommend putting the crossovers at? After that is it kind of a set it and forget deal on them.

Where did you buy your Polk from, any deals?

You think it'll be too loud?
I was going to go with the Rockford 75x2 but just found a nice deal on this amp.

I was originally going to purchase them from crutchfield for $200...
But then I found them for $110 @ CompuPlus.com – Discount Computer Products and Electronics.