Posted March 1, 201114 yr It will be a tight fit for 2 15" subs sealed in the GP. This is a picture of 1 15" Icon in a GP of the same body style. Box stretches from wheel well to wheel well. There is a group 31 battery behind it and the amp, and just enough room to throw golf clubs in between the box and the tail lights.Or another box!!! I got a '97 Grand Prix , you can fit a box 35x17x30-32I was planning on doing 2 boxes 35x17x15 ea. for 2 15''s,1 facing forward and 1 facing backwards....
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