the amp will draw the ohms off what my speakers are correct, so even running them in parrellel, they will still draw the 4ohms right?

No, how you wire your speakers will determine the resistance. Wiring 2 4 ohm speakers in parallel will give you a 2 ohm load. Wiring in series will give you an 8 ohm load. Less load, more power. More load, less power. 4 speakers hooked to your amp(2 to each channel) in parallel will be SIGNIFICANTLY louder than in series. Also running the amp harder and producing more heat.

As long as your amp is 2 ohm stable wire in parallel.

Also, I THINK this amp is rated at 100 watts x 2 RMS. So, if you run it at 2 ohms you should be around 130-150 watts x 2 RMS which puts you at 65-75 watts RMS per speaker.

The 2-ohm power rating of 200 watts x 2 (14.4 volts)

That would give you 100 watts RMS to each speaker! So, you really won't be working the amp that hard with the speakers you have. Buy it, wire your speakers in parallel and SMILE!!!

agreed,....... are there any cons to parrellel apposed to series, battery issues, or drawing too much power, over heating the amp or blowing the amp or speaker?

It will run the amp hotter. Probably drain the battery a little faster. That amp is fairly new so it should have some built in protection so it doesn't fry. But, if you're putting out 200x2RMS you won't be working it hard. Adjust the gain/volume accordingly so you don't overpower your speakers.

I would never run anything over 4 ohms. Just wasting power. I've never needed fader control so I always used 2 channel amps with 4 speakers on purpose so I could do exactly what you are doing now. Never had an overheating problem or dead battery. The only reason I bought a 4 channel this last time is because I bought 2-ohm speakers.

Anybody know how running at 2 ohms instead of 4 or 8 effects the headroom and the dynamic range of a system?

Now you're waaayyy past what I remember from the "old days."

It affects it in the sense that the amp is creating more power, more power means more decibels, although not much, say 1 maybe 2 db more unless the amp's ratings double from 4 to 2 ohms, which some car amps do (mainly Class D) then you gain 3 db.