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It has been pointed out many times that the aftermarket air intakes don't have any air vanes to ensure the air flow is straightened out before hitting the MAF, and that may cause some issues (such as CELs) because the air flow isn't the same over the MAF as it is with the stock air box. Some of the aftermarket filters even boast that they create a swirling action. The stock air box has a single vane (a miminal one), and there is nothing about the stock air filter design that would cause any kind of swirling action.
Rather than find a vane insert (such as a honeycomb that SweetDaddyD found, if I recall correctly) from another car at a junkyard, I decided to make my own simple vane insert. I basically did it with a single sheet of aluminimum, which I folded up, inserted into the air intake at the filter end, and secured with a single short sheet metal screw. The instructions are in the attached file. I have also attached some pictures.
The screw was also placed such that it forms a depth stop when putting on the filter, which makes putting the filter on a bit easier.
My aftermarket intake is a Fujita. I have been running this vane mod for about 6 months with no problems. However, I should note that I wasn't having problems before, once I started a slow learning method when changing air intakes, and cleaned the air filter every 10,000 miles. However, I added this mod for peace of mind. Other recommendations I have for the Fujita can be found here:
http://www.lotustalk.com/forums/f154/fujita-air-19014/index8.html#post1264307
Also, I recommend in your choice of aftermarket air intakes that you get one that has the same (or nearly so) inner diameter as the stock intake. I started a thread (link below) that has some real measurements of inner diameters.
http://www.lotustalk.com/forums/f154/air-intake-inner-diameters-52402/
Rather than find a vane insert (such as a honeycomb that SweetDaddyD found, if I recall correctly) from another car at a junkyard, I decided to make my own simple vane insert. I basically did it with a single sheet of aluminimum, which I folded up, inserted into the air intake at the filter end, and secured with a single short sheet metal screw. The instructions are in the attached file. I have also attached some pictures.
The screw was also placed such that it forms a depth stop when putting on the filter, which makes putting the filter on a bit easier.
My aftermarket intake is a Fujita. I have been running this vane mod for about 6 months with no problems. However, I should note that I wasn't having problems before, once I started a slow learning method when changing air intakes, and cleaned the air filter every 10,000 miles. However, I added this mod for peace of mind. Other recommendations I have for the Fujita can be found here:
http://www.lotustalk.com/forums/f154/fujita-air-19014/index8.html#post1264307
Also, I recommend in your choice of aftermarket air intakes that you get one that has the same (or nearly so) inner diameter as the stock intake. I started a thread (link below) that has some real measurements of inner diameters.
http://www.lotustalk.com/forums/f154/air-intake-inner-diameters-52402/
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