3.8 Intake Options

[1FstYota]

Oh maybe even carbon fiber!

 

[Giant Robo]

build it and they will come!

 

[Rey]

I am on my 4th Genesis. Previous models were all V8s. On each of the previous models I installed a large K&N cone filter #1040 and used the OEM plastic connection tubes to the throttle body.
I also bored the throttle body. See www.maxbore.com. They do nice work, quick and cheap. The bored throttle body gave noticeable power increase, but I did wonder if it degraded fuel economy a bit, as increasing bore has the tendency to decrease density/velocity of airflow.
My conclusions after all this is that the factory OEM airbox is a true cold air intake, drawing all intake air from outside the vehicle. To improve on this one needs an air filter with more filter area and larger air box. The K&N #1040 fits the bill as a larger air filter. A bigger air box that seals off underhood air is another problem. I tried to create a larger airbox using some sheet metal heat shields, but my efforts were primitive. The result seemed to generate more power. Intake noise was low, except on heavy throttle.
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Anyone designing a cold air intake will be well advised to retain beneficial components of the OEM cold air intake tract, and then create the largest enclosure possible for the air box.