MenaceC43

Anyone have the K&N drop in filters? Not expecting any noticeable gains but people have said it messes up to air ratio which seems stupid because the ecu adapts to these kinds of things. Any of my K&N guys chime in and can elaborate on these claims? Thanks

Skim450

good post. following because i am curious as well, i have run K&N on many cars. never heard of it messing up air ratio....

also curious, to add to OP's post...... does it help with sound at all? ive always coupled K&N with aftermarket exhausts, which has always made it quite a bit more throaty sound.
wonder if that would help with tone on factory exhaust on these cars

MenaceC43

I don’t really think it would change the exhaust noise, only the intake sounds. Might get hear a bit more “swoosh” of air but even that might be so minimal you couldn’t hear it over road noise. I haven’t tried K&N’s so I couldn’t accurately tell you but that’s what I figure. I could be wrong.

stockbmw

I bought them because OEM filters in Canada is so expensive compared to USA. MB wants $25 for one where as you guys can grab one for less then $10.

Figured 2x $50 k&n filter cleaned every 6 months was better cost savings for me.

jim04clk

I’ve had them since car was new. 600 miles on them. They do flow more air and are less prone to ripping or bending under high stress conditions. Doesn’t hurt to have. Contrary to what most people think, our stock air box flows more then enough air for this engine. All Mercedes air box’s are probably the best at it from an oem side. Are you gonna notice a difference , probably not. I have this paired with performance exhaust and will be doing a RENNtech tune in the spring.