K & N filters
I feel like they help when the air is very cool; especially when it's cool and dry. The car feels more responsive with them compared to stock paper filters that come in the C63.
Its been proven time and time again that hi grade OEM paper filters flow more air/cfm's than the gauze material in K&N filters.
The only convenience to KN is that they can be re-used.
Also,the K&N oil that flies into your Maf's nichrome wire will most likely cause a CEL or other issues down the road.
IMHO- the only worthwhile mod to a C43 is to swap in a 55 motor. Anything else ,,...pissin into the wind comes to mind.
Truth be told, I'd enjoy the car for what it is, any more power to the tranny and you run the risk of grenading it....unless you have a final year model.







