box plans for 2001 gmc sierra

BlakOnBlak
10+ year member

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i have 2001 gmc sierra ext. cab with 2 10" type r's in a sealed box but i want to build a ported box that will go under my seat. i already know that i need to raise my seat around 4 inches or so. if anyone has any ideas that would help me out.

thanks

 
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BlakOnBlak

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