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      02-24-2010, 02:25 PM   #1
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What aftermarket drop-in filter are you guys using with stock airbox?

I assume most people here use K&N? Any issues with it? (on some applications, e.g. E39 M5 which has dual intakes, many poeple complained the oil off the filter poluted their MAFSs)

Anyone actually dynoed pre- and post filter install? FWIW, I did so on my Audi a couple of weeks ago, a whopping...3whp But wonder if on forced induction it may be a bit better.

What's best place to get one, would prefer a board sponsor to give some lovin' back in appreciation for supporting the board.
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      02-24-2010, 03:01 PM   #2
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We've been getting a lot of great response with the Macht Schnell filters we have. If you don't want to get an intake, this panel filter will be the best you can get on the market today.

Sending more info over PM.
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      02-24-2010, 03:10 PM   #3
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aFe is the way to go. The problem with many aftermarket filters is that they cast the urethane surrounds without a comb set in place so you get drips of urethane down into the filter element. This blocks air flow and reduces surface area of the element. aFe is one of the few filters I have seen without this problem.
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      02-24-2010, 03:35 PM   #4
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Nick brings up a good point. Most cotton-gauze filters will share the same characteristics - cotton, oil, mesh and rubber/polyurethane construction. The MS54B32 goes a bit further, which we'll get into:

Layers
The Macht Schnell N54B30 are an 8-layer construction, twice as many cotton piles as K&N and 3 more than aFe. This allows more filtering and greater oil saturation for dust collection.

Wicking
An important factor not really talked about in the past is the bleed area or "wicking". This is the urethane bleed that is soaked up by the gauze, reducing the surface area of the filter and limiting airflow:

Here's an example of poor wicking on a panel-type filter:



This example (using the Macht Schnell MS54B32 filters as an example) shows very little bleed, keeping the wick area to a minimum and permitting maximum airflow:



Is it the cheapest? probably not. The best? Without a doubt. Rest assured - you are getting the best stock-replacement filter for your N54's powerplant.

Look into this thread here, which will show Mr 5's 335, with the current world record-holding N54 on the dragstrip, equipped with MS filters: http://www.e90post.com/forums/showthread.php?t=349293
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      02-24-2010, 03:38 PM   #5
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///M1,

Been using K&N for 24,000 miles with no issues, & just replaced with new K&N.

Mad.
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      02-24-2010, 03:47 PM   #6
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I feel like this thread is going to end in a cage match between EAS and Jlevi
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      02-24-2010, 03:48 PM   #7
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Quote:
Originally Posted by BrokenVert View Post
I feel like this thread is going to end in a cage match between EAS and Jlevi
Not the intention at all, just putting the facts out there.
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      02-24-2010, 05:03 PM   #8
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Thx for the feedback guys, and appreciate the board-sponsor's exchange. At the end, more enlightenment for the end-user. A couple of quick follow-ups:

The aFe - we are talking about a drop filter, right, not their dual cone? Not intending to put an open-air design CAI. Any links to the product?

Will these drop-filters fit the Dinan CAI? I am not sure if I get one, but if I ever get a CAI, it will be that one (or hopefully another vendor's closed CAI similar in design to Dinan but not in price!)
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      02-24-2010, 05:35 PM   #9
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Quote:
Originally Posted by ///M1 View Post
Thx for the feedback guys, and appreciate the board-sponsor's exchange. At the end, more enlightenment for the end-user. A couple of quick follow-ups:

The aFe - we are talking about a drop filter, right, not their dual cone? Not intending to put an open-air design CAI. Any links to the product?

Will these drop-filters fit the Dinan CAI? I am not sure if I get one, but if I ever get a CAI, it will be that one (or hopefully another vendor's closed CAI similar in design to Dinan but not in price!)
The MS filter will fit the Dinan airbox, since they are only increasing plenum size with the airbox lid.
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      02-24-2010, 05:38 PM   #10
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Quote:
Originally Posted by tom @ eas View Post
The MS filter will fit the Dinan airbox, since they are only increasing plenum size with the airbox lid.
Awesome, just what I wanted to hear!

BTW, what would you recommend in terms of maintenance/replacement? How often would you clean it, does it need to be re-oiled, eventually replaced at how many miles? Appreciate it, Tom.
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      02-24-2010, 05:45 PM   #11
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Quote:
Originally Posted by ///M1 View Post
Awesome, just what I wanted to hear!

BTW, what would you recommend in terms of maintenance/replacement? How often would you clean it, does it need to be re-oiled, eventually replaced at how many miles? Appreciate it, Tom.
Any of the cleaning kits on the market will be fine, most are essentially the same - the important part is making sure regular cleaning intervals are followed.

The aFe uses a vegetable-based oil, for environmental reasons.
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      02-25-2010, 04:11 AM   #12
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I have the "Helene Streamine" drop in panel filter and love it.
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      02-25-2010, 04:31 AM   #13
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AFE's here. Cleaned them for the first time in a year, what a difference on acceleration, unless I am imagining it....
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      02-25-2010, 09:22 AM   #14
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can one of the vendors PM for pricing...i have been looking at the same thing and am on the fence with which drop-in.

thanks
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      02-25-2010, 10:00 AM   #15
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Quote:
Originally Posted by mineo77 View Post
can one of the vendors PM for pricing...i have been looking at the same thing and am on the fence with which drop-in.

thanks
+1 here. But please include shipping costs. If it's gonna run $15+ for shipping then forget it. I'm APO AE.

Thanks.
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      02-25-2010, 01:51 PM   #16
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PM's coming your way
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      02-25-2010, 02:06 PM   #17
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Quote:
Originally Posted by mineo77 View Post
can one of the vendors PM for pricing...i have been looking at the same thing and am on the fence with which drop-in.

thanks
Quote:
Originally Posted by BBBluey View Post
+1 here. But please include shipping costs. If it's gonna run $15+ for shipping then forget it. I'm APO AE.

Thanks.
Sending you both PMs
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      02-25-2010, 02:07 PM   #18
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Any chance for a GB, sponsors?
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      02-25-2010, 02:56 PM   #19
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Quote:
Originally Posted by ///M1 View Post
Any chance for a GB, sponsors?
me likey that idea!!! sign me up!
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      02-25-2010, 04:29 PM   #20
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imo drop in filter is not worth it.... I would create a DIY cold air intake for the same amount of money and get real gains
http://www.e90post.com/forums/showth...ht=mr.5+intake
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      02-25-2010, 04:43 PM   #21
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imo drop in filter is not worth it.... I would create a DIY cold air intake for the same amount of money and get real gains
http://www.e90post.com/forums/showth...ht=mr.5+intake
Mr. 5 is actually using a MS panel and cone filter in those tests.
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      02-25-2010, 05:25 PM   #22
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I believe S&B filters manufacture both the "Macht Schnell" and "BMS" filter, and they used to produce the "Helene Streamline" filter also.
IMO, your best bet is buying the BMS filter. Highest quality and one of the lowest price, where can you go wrong?
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