907 votes
I have had the washable type. Seemed like a lot of extra money and time to maybe get an extra horse and maybe fuel economy. I had just cleaned the filter and had to go somewhere. I threw in a fram air filter and didnt notice anything different.
No performance difference. These are just worth getting because they are reusable.
I have them in my bone stock g37s coupe and I like them. I wasn't expecting crazy power with only drop in filters.
All the tests I've seen suggest the K&N's allow more dirt through than a paper filter. You also have to clean and re-oil them periodically. If you use too much oil you might be looking at a new MAF sensor which can't take oil contamination.
There's no performance difference over a paper filter.
I had one in mine for a little while before reading around and watching videos on these. I noticed my engine made a louder ticking noise with it and I saw absolutely no gain let alone one that would offset the cost.
Mate, I run a K&N in my 2003 Peugeot 206 GTi. Standard style. Off the bat there was no throttle lag (previously I’d have to almost put my foot to the firewall, now I only need my big toe). HP there’s not much difference.
I drank the Kool-Aid and bought the K&N filter kit 8 years ago for my 09 6cyl. Ive put on @ 100K miles while using that filter.I cant say Ive noticed any major improvement , on the other hand I haven’t had any issues from using it either. You will have to clean, dry and then re-oil the filter when its due. Not a huge deal, but adds more time to the job .
If you are handy buy a K&N air filter if you are keep your car >100000 miles and then you will need a recharging kit at some mileage intervals.
I just spend the $50 on a K&N filter for my cars. Another $20 gets you the kit for cleaning and re-oiling. $70 for a filter and years worth of filter clean/renew cycles.
A K&N cold air filter will not hurt , as long as you are committed to regularly cleaning & oiling the filter.
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