looks like I will be buying a JL 13w6 and was wondering if anyone has previously built a ported box for one of these. looking for help or dimensions used.

also I will be putting the box in the trunk of a Grand prix.

 

Honestly man my best advice to you, I just finished installing my 13W7 in the box I built in my grand am. Get someone to build it for u! It saves u the heart ech and it will sound 100% BETTER! Like I said, jl subs want to be in the right box and need to be in order to sound right spend the extra doe since u prolly already blew like 400 bucks and put it in a custom box!

 

Thanks for advice, but I think I am going to build a box, because I don't have anymore money to pay someone, when I can do it myself. I just need a plan.

 

I can give u the plans but I'm telling u wait. And spend the money it will be well worth it.

 

The JL boxes are actually pretty nice.
JL Audio: Products
That'll probably help you out. At least to give you a starting point