yeah this box is to big to put in my trunk

 

+ 1

Why are we running a 4 ga into a distribution block then to 8 ga?

And just about anything is loud in a hatch, a single 8" in a decent size box with 150 watts on it will seem loud in a hatch. You may just be in need of upgrading your amplifier and woofers.

If you want to see some...
https://mustangforums.com/m_5014931/tm.htm

 

why is there a d-block at all?

 

i was not able to cram the 4ga into the amp. That amp is made sucky in some ways. I'm about to go get a pioneer amp or something.

 

also . where are you guys using for a ground?

 

any solid piece of metal will work as a ground. Scrape the metal and make is as secure as possible. When you are done give a good pull on it and it should not move at all...