10-13-2018, 09:44 AM | #1 |
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Charcoal Filter Removal How-To
Yes, the F90 M5 is burdened with the charcoal filters in the air boxes to make it 50 state compliant (thanks California!). They are pretty easy to remove.
Step 1 (Red) - Remove these plastic covers. They pop off with a light pull strait upwards. Step 2 (Orange) - With two flat blade screw drivers on either side of the center pin, gently lift the pin up then remove the plastic pop rivets. Step 3 (Yellow) - Loosen the two hose clamps on either side of the air hose and remove air hose. Step 4 (Green) - Remove the two bolts for the metal brace. Step 5 (Blue) - Loosen the 6 bolts that secure the air box cover. BMW finally got smart and designed these bolts so they don't come out all the way, they have a retainer on the inside to keep them attached to the air box lid so you can't drop them down into the engine bay. Step 6 (Purple) - Drivers side only, loosen the bolt that holds the rubber shield in place. Step 7 - Lift air box cover and use a flat blade screw driver to pop the charcoal filters out of the air box cover. Step 8 - Reinstall the air box cover making sure it's on straight and makes a tight seal all the way around. Reverse steps 7 through 1 to reinstall everything.
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10-13-2018, 10:16 AM | #3 |
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When you lay the charcoal filter on top of the air filter, it shows how much of an area restriction it actually is. Hopefully, some drop ins will hit the market soon. The factory airbox, while not perfect, isn’t too bad.
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10-13-2018, 11:10 AM | #5 |
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These are not the air filters. The air filters are tan in color with an orange rubber gasket. Those should stay in when you remove the charcoal filters. These are in there for CA EPA regs to absorb any gas fumes that might leak out while the engine is shut off.
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10-13-2018, 11:24 AM | #6 |
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So is there any harm in pulling them out to the engine? Any performance benefits?
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10-13-2018, 01:16 PM | #8 | |
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Quote:
Most people who pull them (including me) feel there is a small benefit. It's not going to shave time off your 0-60 speed or anything that dramatic, but the engine seems to rev a little easier since it can breath better with the removed.
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10-13-2018, 09:18 PM | #11 |
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Increased airflow.
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10-14-2018, 04:04 PM | #12 |
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10-14-2018, 05:30 PM | #13 |
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10-14-2018, 08:06 PM | #14 |
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10-18-2018, 06:42 PM | #17 |
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10-18-2018, 07:20 PM | #18 |
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10-18-2018, 07:30 PM | #19 |
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10-18-2018, 08:05 PM | #20 |
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11-10-2018, 01:07 PM | #22 |
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I"ve not yet done it on the F90 M5 but I did it on my 15' M5 w/ K&N Drop-ins and there was a notable improvement in sound (compared to stock).
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