Here's some more information for you that hopefully will help inform you and not start a dog fight here.:cheers:
Cold Air Intake Systems - Facts and Myths About Aftermarket Air Intake Systems

Great read thank you. :cheers: still not sure if I want to install it or not...:dance:

I don't know why people are so vehemently opposed to a mod that provides modest HP but serious sound improvement. I could not be happier with the change in sound after installing the cat delete pipes and top speed muffler and that did not add very much HP. I have considered installing an after market intake just for the sound.

I also note most of the people who are against it are people who have not actually installed one. I can't recall seeing too many "why did I install this it was a big mistake" aftermarket intake posts.

I installed a bmc direct air injection cai and it was a big mistake - killed the maf. it is now out of my car and I have a 987 airbox (oem, sealed to the outside, cone paper filter, sounds fine) in it. much better.

I bought a car with a bmc carbon dynamic airbox in it and, guess what, killed the maf. it is now out of the car.

Keep the stock airbox or put in a 987 box.

Using reputable test equipment and methods, a test of a BMW k-bike was performed
The test compared
Stock filter
Stock filter half blocked off
No filter in airbox
K&N filter installed

NO difference in airflow was measured among the 4 configurations.

Given this along with the experience of many that K&N has trouble providing rectangular filters in correct dimensions and that the filters themselves are known to deteriorate/collapse, they are simply items for fools. Indeed enjoy the noise

If you go to K&N's FAQ, they state 1 to 4 hp might be possible. They also state that nobody has any proof that their air filter will kill a MAF sensor and that their air filters will not kill a MAF sensor stating " it is both impossible and ridiculous".

Lots of info there.

K&N Frequently Asked Questions (FAQ)

I've been using K&N air filters since the late 80's and never had an issue with using them.

I agree with JAAY, either leave the stock air box or use a 987 air box.

hah! it happens so infrequently they had to devote an entire page of their website to it. what did shakespeare say? "methinks thou dost protest too much." regardless, I have no empirical evidence, just cause and effect - no maf problems for life of car, add oiled filter element, maf fails. twice. and this is the supposedly more robust 125.01 maf in both cases. perhaps just poor luck and bad timing, but I won't take the chance again.

lol TRK. I don't buy into them saying it can not happen. I took a leaf blower to mine before I installed it to push out any excess oil. It didn't look to be over oiled, but I didn't want to chance it.

I decided to keep my stock box...I'll put the cold air on eBay and put the $ towards another mod...thanks for the feedback!:cheers:

Scared
 

You guys are scaring the be-Jesus out of me. The first thing I did 3 years ago was put a K&N in the Boxster. I'll be replacing it with a stock filter tomorrow before I head to the Parade.

3 years and you think it's going to hurt your car now? :confused:

Not really. If it has done any damage it's already happened. But I am getting tired of cleaning and oiling it. If it made any difference in the performance I guess I'll find out. I have a K&N on the Harley as part of the stage 3 ensemble. I would think HD would have tested this out.

Just to add some references to this thread for future readers.

When I googled "oiled air filters test" these were the first three to be displayed. None of these were the car mag and Consumer Reports mag tests I referenced in another posting. The conclusions in each were consistent with each other and what I remembered.

I did not go beyond the first three because the references were to data from makers of oiled filters who are presumed to have a financial interest in the way they present things.

Air Filtration Test Bob The Oil Guy

http://www.nicoclub.com/archives/kn-vs-oem-filter.html Nissan Club Member

Air Filter Comparison Study - GM Truck Central

Almost everything we choose is a trade off. It is OK to have different priorities.

One from 2007 and two from 2012 performed on GM trucks and this is the conclusion:
"we can't say that all oiled filters are worse than dry filters, but from the data we saw, it is worth noting their placement."
Each of us takes our own risks/rewards for the mods we choose to spend our money on and the debate over CAI/oiled filters will continue just as the debate over which oil to use or which spark plugs are best. I know this, after 3+ years of oiled CAI use, my Boxster, with 117K miles, runs just as good, and perhaps better, than it did with a paper filter and restrictive OEM air box. Max torque and hp kick in around 1K rpm sooner than with the OEM filter. The oil that is drained at 5K miles, and the filter, are almost as clear as the new oil put in. If there is any motor wear after three years it doesn't seem evident. I've never recommended anyone do the mods I've done, it is their choice, I only give my experience when asked.:cheers:

So all of this is not to be believed?...

https://www.youtube.com/watch?v=WN_h9juITLk

Leave the stock filter, remove the snorkel and remove the air-vibration expansion/damper (replace with a rubber cap and worm clamp). Huge noise, cost $3.

You lose the 'tuned' aspect of the stock 986 intake track by removing the expansion chamber, but my butt dyno doesn't notice a difference while my ears certainly do!

I don't know numbers, but at some point more air must better than "tuned" air, no? I mean, can you even give an engine too much air?

if you want more noise, just de-snorkel it

By removing the expansion chamber, the engine still physically has access to the same amount of air(didn't change the size of the intake or intake tube diameter), but removing the chamber actually makes it harder for the air to get into the engine because of destructive interference with the resonant frequencies that are no longer dampened by the chamber. I'm not sure how much of the chamber was for performance versus for US intake noise regulation however...