adding two 8's up front

[audiolife 5,000+ posts]

how bad would this make my system sound if i built a seperate enclosure for two 8's SEALED up near the front of my blazer? I don't have room for kicks, nor do i know how to fiberglass them in... but i want to be able to bring some bass forward for my rock music (the drums, the acoustik guitars, ect...) I can barely hear a lot of the notes from my sx...
I'd be treating the 8's as mid woofers... to play notes from 80-120 or so...

Thanks

wouldnt hurt there been a few cars do this with success some people say not to if you adjust it right no problem. another thing you might wanna try is getting your mids to play lower (depending what they are) you can be pretty successful with that as well. more speakers though isnt always the answer the best full systems i hear still usually only run 5-6 or less total drivers