- Mercedes-Benz C-Class AMG: How to Replace Air Filter
Step by step instructions for do-it-yourself repairs
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K&N High Flow Air Filter Installation
I have used advanced aftermarket intakes and filters on other cars that were not engineered to the level of my CL or my M113.
The idea that MB would not use a superior intake and oiled filter technology in an AMG if it were better performance wise is quite doubtful.

That's against the law (At least where I live.) Mercedes would have to honor the warranty, unless they can directly prove that the failure was caused by the after market part... <Which in a scenario like this, they probably could not.>
To see if my tracked Rx7 needed a K&N drop-in filter upgrade, I used my trusted Dwyer differential pressure gauge, 0-100" H2O pressure.
Dwyer pressure gauges, Ordering
At first it showed about 1.3 psi drop from the snorkel to just after the filter. I then took the filter out and ran with no filter, and got the same results. I found there was a restriction in a transition in the inlet ducting, so I fixed that and droped in the oem filter and all pressure drop was gone. So the K&N would not help performance.
Now K&N has some cold air filter systems that may help on some cars, doubt it on a W204.
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Just wondering if anyone had instructions for air filter replacement in a w204 UK car c220 2009. The engine cover and air filter replacement DIY appear relevant to US cars only?
I take it air filter box in located in left lower quarter under the engine cover?
would be good to hear your responses ?
cheers
I called K and N and they said they guarantee they won't clog the MAF. They said to send them the bill and they gave me half of my money back.
I used K an N's on my old Yukon with no problems but I don't recommend K and N's on the Mercedes. Be careful!
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