Got this from this link here on another thread:
Any V6 owners agree or disagree w/this info based on personal expirence? Especially insterested if you have an 2002 or 2003 since there was a slight change from Ford.
I am not sure If want to "customize" my BBK CAI when I mount it by using the stock round screen, placing it somewhow before the MAF sensor to "str8en" out the air. He states the MAF might jump around since the MAF has issue figuring out what exacly to tell the computer. He talks about cruise control and taking coming out of cruise and how the car doesnt jsump around before it regulates. If there was a place to put it and know it was secure, i'd do it, but im skeptical if I want to bother. Whatcha guys think
Q) The stock induction has a metal screen that falls out when I take out the MAF. Do I need to re-use that too?
A) Depends, please read the entire answer for your situation. The screen is not needed, or required when you install the CAI. But save it with the old induction system, you never know when you may need to put the old system back on. Some people have put the screen back in. Please be aware that the system was not designed to easily incorperate the screen. Thus, some people have expierenced air leaks, while others have not.
The screen however has been proven to show that it does stablize airflow, as a member of 3.8mustang.com found out recently. Here is his discovery:
"I brainstormed all night about how to fix this and it hit me. In the stock induction there is a aluminum screen (it's circular in shape and made out of aluminum screen). I thought if I loosend the K&N and attached the aluminum screen before the MAF it would be enough to diffuse/stabilize the incoming air. I was right :thumbup:. It might be a slight restriction but it's worth it.
I drove around for a hour. I took it up to about 50-60mph and then took my foot off the gas and cruised. Usually it would buck multiple times until I would put my foot back on the gas but not anymore. I did this around 30-40 times."
More turbulant? Yes and No, but I do see where you're going with this.
In the stock induction the airflow is completly changed in the stock filter housing. It's filtered, and then it has a straight run into the MAF through the screen... all in all, very effective in getting accurate readings of airflow because it's running evenly through the system.
Wit the CAI, the air is filtered, then goes through a huge 90 degree bend, causing the airflow to actually become turbulant to the point that when it reaches the MAF, the airflow is still trying to re-stabilize. As such, surges of air (or lack thereof) will cause innacurate MAF readings.
Thus putting the screen in can quite possibly be your ticket our of getting the CEL that has popped up on your Mustang. But keep in mind however, these cases of the CEL being tripped from the installation of the CAI are low. I personally have only come across a handful of people with this problem over my 4 years on studying CAI systems.