Bought K&N filters for my c43 since the stock ones were original. Car runs like sh*t and feels like it can't breathe at 3500+ RPM. Putting stock back in. Reset the ECU. Still didn't help. Waste of $130

I could have told you that lol.

The oil is why it sucks. Someone told me to leave it outside and let it dry up for a few days before putting it in the car.

The oil got on your MAF, likely need a new one now.

I learned this lesson on my 94 C280 in about 2001

Fully Agree with you guys,,

[!!..buying oily filter = buying Headache..!!]

any kind of particles or liquid will harm the MAF film reading, that will definitely affect to the air performance system during high temp..?!?

absolutely you will not know or even not feel this, cause you're not room mate in the MAF house..!!-"I"-!!

ZAYED,,

They were on for 5 minutes

I took mine out, took apart the airbox and washed it before putting stock ones back in

I have always used K&N filters on my cars with no problems. Here's what I do when installing them:

Don't over oil
Let it sit for a few minutes
Use a vacuum to pull oil off the filters
If the vacuum seems to have pulled to much, spray some more, let it sit, vacuum again.

I've not had problems as long as I do this procedure.

An alternative to this is AFE dry filters-same design except no oiling needed

ive had K&N filters in 3 of my vehicles, including my C43, never had any issues.

Guys! I VERY carefully read all the poop sheets that came with the K&N filters. They are preoiled! you can tell from some very slight oil in the packaging bag and the smell. I may be wrong and people are supposed to tune into some tribal knowledge. If so please let me know ive got to oil them.

And...But...you have to wait overnight to let the things dry. This MAF soilment talk makes this seem a realistic thing...let em dry!

All thats said I definitely think I have a noticable power increase over the genuine OEM paper filter. Ive straight pipes from the primary cats so cant hear the intake, for sure.
Even my daughter said the car felt "lighter"...I kid all not.

Good Input..

ZAYED,,

New stock filters installed and MAF cleaned. Runs so much smoother

Excellent MaaaaaaaaaaaN..

Did you do a battery reset too?

Battery no, mbstar reset

No Problems with K&N.