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Basically Stock
2009 GS Turbo. 2007 GT
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6,845 Posts
Fully closed is the point, because it doesn't draw in engine bay air. If you want a larger opening, then open up the inlet on the front of the box, and run it somewhere there is cold air. Like a cold air intake does. Luckily, the volume of air is quite small on a NA 4G69. So even a stock panel filter doesn't see as much of a difference as you would on a higher power vehicle going to a cone filter

Once you cut open the box, it's like using an umbrella to keep you dry in a swimming pool.
 
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