Since I was in the area, and needed to swap out the cabin air filter, I opted for one from K&N. I have upgraded to the B5.5 filter housing so that is why this should work. There is a slight length difference but it does fit.
A filter shouldn't void a warranty, and K&N even offers to fight warranty disputes with dealers who claim the filter did it. The top actually secures the filter in place. You can take it off, but I would check it once a week to be sure it didn't pop off the intake tube. a high flow filter is for increased air flow (easier/faster air intake) and not temp decreases. I have a snorkel and I have NEVER had water on the filter, but I also leave the airbox lid on (my 2013 has a ~1" gap between the hood and bumper that water likes to go through to the engine compartment). Oil coated air filters require you to wash and re-oil them every so often. The oil is what catches most of the dust.
Had K&N's for years. Never had a problem with them.
I went with K&N, perfect fit in the stock box and reusable so you don't need to replace each time, just wash. It's a little pricy up front. But worth it in my opinion.
Noticeable difference off the line and cruising at low speeds with the K&N filter and pipe. Pre-tune I still noticed a small difference. Maybe combined with the turbo muffler it does something. Once tuned it will make a larger difference.
new air cleaner (K&N cone filter)
I go for K&N. No complaints. Also, they have that nut on the end, so you can wrench it off.
I have run K&N's on all my cars as far back as I can remember. I'm waiting for spring when I can do a baseline comparision of HP before and after the K&N install with my GTECH Pro competition before I do the installation.
They are expensive. Expensive to buy, expensive to maintain. For the $75 or so that this filter costs, you can buy a half dozen top quality conventional filters and change them frequently. Price the K&N filter cleaning and recharge kit. For a filter to work, you must clean and re-oil it, not just stick it in and forget it. Following the instructions in the $15 recharge kit, it takes a half hour to do this, adding unnecessary time and expense to your maintenance. It amuses us in the shop where I work when these come in the door. People pay a lot of money for them, but when we try to sell them a cleaning and re-oil service for a visibly clogged filter they usually decline the service, because it is "a lifetime filter". There is no noticeable increase in power, fuel economy, or anything else that could possibly justify the installation. You will notice absolutely no difference afterward, other than you have less money. Go down to your local race track or drag strip and look around; I have *never* seen a $30,000 racing engine with an oil type air filter on it. Incorrect installation or maintenance *can* cause damage to your MAF sensor. GM even had a service bulletin out a few years ago advisiing their dealerships that failed transmissions due to over oiled aftermarket air filters were to be denied under warranty. MAF is a critical input for calculating transmission shifts; apparently contaminated MAF sensors were resulting in slipping during shifts causing failures on new cars that had warranty coverage remainiing. Why risk problems when there is no gain to be had?
On my mk3 I ran a fuel cell gravity feeding a bosch 044 pump with -6hose. I chose a K&N fuel filter that had a billet aluminum body with a screen disk as the filter. K&N verified this was OK for fuel injection. Well, the pump was so high flow that the screen filter was a real restriction and bent the screen kind of forcing it half way through the hole.
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