aigooalex

I have a lil over 50k on my 07 w203 and decided why not and change the filter since i'm also getting a tune very soon. So i just went to autozone and picked up the k&n drop in filter. It is probably the best $80 bucks i spent on for this car . I feel so much more response than the stock filter and the car jams real well!




what do you guys suggest for engine bay cleaning. Mine is filled with filth and needs time for cleaning

W203E35

Same with me but then it went away the next day.

aigooalex

haha i hope not =(

pcy

If replacing the filter gives significant/meaningful difference in performance, I don't understand why auto manufacturers don't make it part of the stock car. All auto manufacturer's have smart engineers, including MB. There must be a reason why MB engineers are not putting those filters on the stock car.

Viper98912

Two reasons:
1) There are certain things that are less reliable in the long term. In this case, many aftermarket filters normally filter less to allow more airflow. For a stock car, most non-enthusiasts will not care about the performance increase but will care about longterm reliability.
2) Cost. Every penny counts when building a car, and the best-unit-per-dollar rules all.

Xhale707

Ohhh man that was so funny i was thinking about buying these when i was reading the first post. Then i changed my mind when saw this haha.

eesjunin

With my experience its the 2nd...i installed my K&Ns when i bought the car 6 years ago with 40K miles...now aproaching 190K...same K&N's...annually maintained and recharged...i also looked at my MAF last year...its was looking like brand new, no residue or anything like that
Go figure

phister

you could also do the little DIY of cutting the "ribs" off the box so the air flows smoother.

W203E35

Does anyone know if the MAF adjusts? I mean when I put the K&N in no joke I felt a huge difference. But now nothing really. Is this because my MAF adjusted to it?

cpbeasley

im not sure but doesnt a tune set the air/fuel ratio at WOT? If that were the case, then shouldn't it accept the larger volume of air, mix it accordingly and the improved performance stay?

W203E35

When my car was being dyno tuned, I didn't have K&N filters. And Jeremy told me my car was starving for air up top. When I put these in I felt stick power. Maybe I got use to the power

Javvy

Karo...Yes the MAF adjusts to recah the pre programmed optimal level.....

and eess....K&N's...annually maintained and recharged... serioulsy you maintain the K&N annually..........man then you got it all wrong..........every oil change which for us is 10-12K you are suppose to blow all the derbis, wash em and dry em and then recharge them, no wounder your MAF looks brand new....but if you will follow the correct routine maintenance schedule on the K&N you will see considerable deposit on your MAF.....

just my 2cents...

Javvy

tommy

The correct maintenance per K&N is to clean and recharge every 50k on a street-driven car, but visually inspect every 25k.

Actually, if there were as much of an issue with the oil as the paranoid people on here claim, ess would have a dirtier (with oil) MAF than people who use the stock air filters.

I'm calling a on this whole issue. I didn't have any issues on my Green filter before it died, and I haven't had any on my K&N for the past 4-5 months. Though it seems like everyone has their minds set on which side of the fence they're on, no matter what.

LILBENZ230

I really can't say I care that much, I'll continue using the OEM filters. If there's even a slight chance that a K&N might cause a problem, I'll pass. It's just not even worth it.

kimito

Where can I get a K&N filter for my c180 kompressor??

draz.amg

C63 Dreamer

Just changed mine today, but went with Wix, what I've run in all our cars. Haven't really driven it, but can't say I notice a difference.

My car does feel EXTREMELY sluggish compared to my friends 06. That's why I changed it. Still sluggish though.

TemjinX2

The K & N's give you a little bit better throttle response, thats about it. You get use to it after a day or two. Thats why you feel like the response went down when really your brain just got use to it.

Its the same effect when you switch from 19'' rims down to 17'' rims and feel wow you have a faster off the line response. Then after a day that feeling goes away since you get use to it.

chargedC32

even if you replace your old filters with brand new oem paper filters you will feel the difference right away...

from experience, K&Ns or any of the drop-in filter dont have any gains in HP or any better MPG.. just makes the engine sound throatier under hard acceleration

tommy

Please post before and after dynos, thanks.

W203E35

Impossible...the amount even if gained will be inaccurate unless the owner does pull quickly swaps filters and does a pull again. Even then the reading might still be inaccurate.

tommy

He said he's the one with experience of no gains, not me. How else would he make his claim? Butt dynos are even more unreliable than actual ones.

Just trying to separate bs from facts, which is pretty easy, since there is so little data on this subject.

Xhale707

so do the filters help or not. I was going to buy these 2 years. Still thinking about them. do they make any type of intake noise?

Ive been cleaning my paper ones for so long 2 cheap to buy replacements

aigooalex

such big debates haha! I personally just bought the drop in filter because mine were damn dirty and with 50k i thought why not change filters. I used K&N for a while and never heard anything bad about them =/.
They are also washable and re-usable. Just gotta be careful re-oiling them biznatches.

The only time i did feel any difference is when i put them in, i felt more response than the factory ones. I still think the response is a lil better but i can be mistaken.

I don't think they are a bad quality filter but thats my 2 cents.

W203E35

Makes sense, sorry.