AMG-010

Im sure this topic has been covered before but I have searched and really haven't found what is the best aftermarket Air Filter for C63 if any.
Is it actually worth doing. Any gains? K & N or BMC?
From what I have read seems the oil on the filters can cause problems. In Australia we don't have charcoal filters. Would I be best just leaving factory filters in?
If there is already a thread on this topic can someone point me in the right direction.
Thanks

DTMCLK

I've had BMC installed, no error or warning light so far to date. do a search on "filters"

C63newdude

You might want to add the pipercross foam filters as well. There are a few people running them here on this forum.

AMG-010

Found some Pipercross here. There not cheap though
http://cgi.ebay.co.uk/PIPERCROSS-FIL...item439c68b638

SonnyakaPig

As strange as it sounds, BMC's feel very different from stock paper filters, even when you have the carbon filters removed.

The engine revs faster with BMC's in. The torque hit comes harder and is more available with the BMC's.

Like others have said, I have experienced no CEL's or engine codes with BMC's, or carbon delete, but and this is a big, "but," the BMC's cause the car to have a chugging problem and some surging.

I don't know what this is caused by. It's not the oil, because there is no oil residue on my MAF or the inside of my air boxes after several thousand hard driven miles.

I believe it has to do with the extra air coming in through the BMC's and how that interrelates with the eletronic throttle control that is set to function with the stock paper filters. So, it seems like the chugging problems with the BMC's really only happen at very low speeds when light throttle is engaged.

If you engage the throttle too fast with the BMC's, sometimes, the car will literally skip a beat before it wakes itself up and leaps forward (and with the BMC's it will leap forward more so than it will with stock paper filters, which do make the engine feel a little more starved for air than the BMC's do.

My experiences.

That said, I really liked the BMC's. And I will most likely re-install them soon. But, overall, the car drives smoother with the paper filters. Plus, the BMC's make the car a bit louder, which is nice.

DTMCLK

I've noticed this also when I want to do a quick acceleration in the middle of traffic, the car does not respond immediately, there is a bit of delay which i thought because im in the wrong gear, but the transmission should lower the gear immediately without any delay.... so will ECU performance upgrade eliminate this issue? so the BMC should work in parallel with upgraded ECU flash ? that would be my guess

Baby Gorilla

I noticed the "throttle delay" when I had the car totally stock. It was my biggest gripe with this supposed performance car. I have since had a Kleeman K1 ECU tune and installed K&N filters. This has helped somewhat, although the delay is still there sometimes when I'm in "S" or "C" mode. The only way I have found to get around it is to stay in "M" mode as much as possible.

obsidian05e55

Anyone try the Sprint Booster on the 63? I had it on my E55, and it made the throttle response snappy

SonnyakaPig

I believe a dyno tune or road tune can properly dial in any issues with the BMC's. Perhaps a flash tune could accomplish this, but it would be luck if it did the trick -- not saying it couldn't do the trick.

drawde

Could be wrong but I was under the impression that you don't need a sprint booster if you're tuned?

Quadcammer

unless someone can prove the stock filter is a restriction, I see no reason not to use the excellent OEM paper filters.

RNS-11Z

on the dyno i noticed no difference between the factory filters and the bmc