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The best intake setup is when you have a cone filter stuck way out in the airflow, attached to an icemaker (to ensure the coldest possible intake temps), topped off with one of those Vortex propeller things that swirls the intake charge. When you put it all together it's like a 60% power increase.
Noah,
This one offers a 63% increase and can be fabbed in less than an hour. Icemakers are so '80s!
On my 03 Infinity G35 Coupe, I had a AEM cold air intake put on that put the cone filter element outside the engine compartment just behind the lower front bumper. This did help significantly.
On the G35, the cold air intake creates more like a 75% power increase. For real.
we saw a lot of 996's at our shop with these ridiculous things...like Steve, we had a nice collection of them on our shelves...right next to the blown MAF from the same car.