With my brief experience with MAF maters, i can say that a CAI is not always the best. Especially when you have to relocate the sensor into a tube.
If you think about the stock setup it has the meter right on the airbox. Change the sensor location and you will change the way the meter measures the air. Now it may not change it enough to cause problems. the ECU maybe be able to adapt enough to compensate for the higher volume of air.
Getting a K&N airfilter and running a 4" air duct from the front of the car to the airbox wouldn't change the way the MAF meter is setup to measure air.It will allow more air flow though through the same components.
I did a nice little test on my SVO with my meter due to a MAF conversion, and i was shocked to see how much the meter can vary its measurements for vibration and different size tubing.
Example. my MAF was setup originally to have the meter on a few couplers going straight to the Turbo. A/F was set at 11.5 /1 across the board. one issue i had was idle and, off turbo decel. the car would stumble and die (BPV installed not a BOV). MAF voltage at idle would vary from .9-1.4 volts Idling.
After taking the same meter and adding a flexable hose that was .5" shorter in diameter and 1.5' long, i was able to isolate vibration and smooth the airflow through the meter. Now with no computer changes and i have a lean condition in upper rpms. As lean as 13.2/1 A/F. (WBO2 in car). BUT at idle the MAF read a steady .88-.92 volts at idle and the car DOES idle better. (must retune for top end.)
My point is a CAI will work, could it throw a CEL, depends on how much the computer can compensate. Would a modded airbox with ducting work? Sure would, and would be less likely to throw a CEL. It would also allow the MAF to Measure the air correctly since its parameters didn't change.
Now can you run a 4" tube from the front of the car to the airbox, umm i dunno i haven't looked hard enough. Either way you choose to go, the end result is more air for the ENGINE to pump, thus more power. One last note, most people perfer the look of a CAI.
sorry for the novel.
