Air filter K&N or Fram

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 have used K&N filters on many applications with 0 problems.

K&N Filter Replacement

I just did the switch to a K&N filter recently on mine. Did not notice any difference. I remember feeling a greater difference in my VR6. Maybe its the fact one is N/A and the other F/I.

I found a used ABD racing filter and I could feel it with out a doubt. I bought a K&N filter and drilled holes in my box and I say it was a waste.

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?

they let too much dirt pass through i wouldn't use them, especially on a turbocharged vehicle. the turbo will just suck all the oil out of them.