plan on making a box for a box for a DC level 4 18"

what do you think?

I like it!!

How much power on the LV4?

probly a Audioque 1200d

Go for the AQ2200, gives you more power, and you can have some headroom.

what do u mean by head room

You will be able to push the sub without straining the amp to bad.

And the amp has more power available.

oo seems a little 2 expensive though wanna stay under 300 if possible

Then the 1200 would be great for you!

You will love it, I installed one for a friend. It is pushing an L7 15" to it's limits. Gets pretty smelly.

i got another question wouldl it be louder it i have the port up or back if i have it up i can make the box a bit bigger

No way to tell.

Build and testing is the only way to know really.