Custom extended cab Silverado build help

[checketts4344]

I have a 2006 chevy 1500 extended cab, I have raised the back seat 3" to fit my alpine type r 12"s. box is build but i am searching for some help on how to port it properly. the amp i am running is an alpine MRP-M2000. the main area of each side of the box measures 20"x16"x13"on the tall side 10" on the short side. air space inside is about 1.5cubes per side.

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[els1989]

Not enough air space...

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[CSCStang]

I have a 2006 chevy 1500 extended cab, I have raised the back seat 3" to fit my alpine type r 12"s. box is build but i am searching for some help on how to port it properly. the amp i am running is an alpine MRP-M2000. the main area of each side of the box measures 20"x16"x13"on the tall side 10" on the short side. air space inside is about 1.5cubes per side.

Texted you back.