That's bullsh*t. Aftermarket air intakes don't do anything but add sound & looks. If that's what you want, I'm fine with it but don't try to convince me that you gained any power.
A pipe is as big as its smallest diameter. If your intake manifold and throttle body stay the same size, it's useless to add a bigger intake since the opening is the same. Plus, metal transfers heat better than rubber. This heats up the air, thus making it less dense. Notice that expensive sports cars still use rubber intakes.
When any 4-stroke engine is running
@2000 rpm : 17 intake strokes per second per cylinder
@4000 rpm : 33 intake strokes per second per cylinder
@6000 rpm : 50 intake strokes per second per cylinder
At these speeds, it's not a bigger intake that will help adding more air into the cylinders.
Think about it. Get 2 buckets: one big, one small. Drill the same hole in the bottom of both. Add water. Do you think the bigger bucket will let more water/time escape? No, because both holes are the same size.
Get your cynlinder head and intake manifold ported, a bigger throttle body, bigger complete exhaust and then bigger intake. This will create better air flow, but at this point you might as well get yourself a bigger engine.
