2004 GTO build ideas

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I recently bought an 04 GTO and I really wanna build a solid system for it. My main problem here is the gas tank in the trunk.. I don't really know how to approach this, so I'm looking for some help on what subs I should run and how should I design this enclosure.

I found 1 thread of a guy that had a sp4 15 on a crescendo 3500, sub up port up. But could only hit 139, I would like to get in the 40's. I have an aq 3500 from my last car to work with. Any ideas or advice is much appreciated.

http://gtcarlot.com/...k-81419778.html

Here's what the trunk looks like

Click to read more...

 

[jeepguylv]

link doesn't work, says page nt found

 

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View attachment 26554184

 

[Slowed]

Sorry about that

 

[Umphism]

**** I wonder if they bass would travel through that

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