Air intake in fender?

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ciper_

Air intake in fender?

Post by ciper_ »

The intake is not in the fender. That is one of those crappy "mushroom" foam filters facing towards the hole that use to serve as the inlet for the stock air box.

There are CAI (cold air intakes) that will run a pipe into that area and have the filter reside inside the wheel well. In my opinion this type of intake is of far better design than most of the random cone filter that sucks hot oily air from the engine bay.

The other side benefit most of these have is that the filter is not directly on the AFM. If the filter resides directly atop the AFM with no velocity stack the car will get erratic readings and in the worse case scenario damage will occur (it has happened).

The majority of "tuners" believe that any filter is better than the stock air box. In reality they hurt performance in the low end if not over the entire range. The performance hit comes from many places including the now turbulent air that is passing over the sensor. I will try to find the site but a great Australian site measured the amount of vacuum or negative pressure in different places throughout the intake of a few random cars. They found that even small changes, like reducing the length of a pipe that seemed to be a restriction hurt performance. In other words the parts that look most restrictive actually benefit the system.

In short, dont take any ones word for it. Have them prove to you the benefit (and not using some stupid g-tech unit).
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