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Old 02-17-2016, 06:11 PM
Clockwork Clockwork is offline
Join Date: Feb 2011
Location: Calgary, Canada
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Dinan CAI filter options & my experience

So I've reviewed a bunch of threads on Xoutpost about replacing the Dinan's CAI filter and the list of air filters that can be used is kinda everywhere... so I'm putting together this list for convenience.
I have NOT tried any of these, but from quick measurements taken (I will be double checking soon) it seems these (and maybe more) model are available to use as options for the Dinan CAI system (I can not speak to any other CAI as clearance may be different than the Dinan air box/metal shroud)

measurements of Dinan d403-0410 air filter and of Dinan air box installed and clearances inside (see pics below).
D403-0410 measures:
Flange (rubber boot) ID: 101.6mm (4")
Base of filter medium: 138.4mm (5.45")
Top of filter medium: 112.3mm (4.42")
Length of filter medium: 163mm (6.42")
Length of air filter: 182mm (7.16")

EDIT: Volant/AFE/AEM links updated May 2021:
after 5 years of very successfully running the Volant Powercore, I'm tring the AEM DryFlow this time around. I feel the Volant is best for low maintenance, as you never need to wash it, but it is a great idea to remove and air compressor blow out the pleates from inside out. I did that yearly and yes some VERY FINE powder/dust came out slightly. BUT I want more grunt sound from the Air Intake kit (which is the ONLY reason I ever installed the Dinan CAI kit) and I know the Dinan/AEM/AFE cone air filters make the exhaust growl deeper from very temporarily using the old/used Dinan filter that came with the kit.

Another EDIT: So I received my 7" long AFE Brute Force and upon install, its a VERY TIGHT squeeze just to get it to sit in there. I'd definitely recommend a 6" long, at max air filter, so install/removal is much easier and you do not have to slightly misshappe the filter to get it on or off then. the issue comes from the metal tab that is welded to inner fender wall and normally supports the factory air box. Now my new AEM sits super tightly up to this beige tab. OOPS

Dinan: d403-0410 (needs to be oiled)
Replacement Air Filter for Dinan Cold Air Intake - Dinan, Leader in BMW Performance Parts and Upgrades

K&N: RU-2590 (needs to be oiled)
RU-2590 - K&N Universal Air Filters, Universal Rubber Filter direct from K&N

AFE: 21-91057 (does NOT need to be oiled) (7" long)
AFE also sells 2 other kinds which need to be oiled

AEM: 21-2057BF/DK models (does NOT need to be oiled) (brute force model, which just means its using a synthetic material instead of cotton/gauze) - just purchased this one to replace the 5 year old Volant (Donaldson) Powercore 61509 (traditional media/material used)

Volant: Power Core 61509 (IS NOT oiled, but is NOT washable either) 99.9% air cleaned. Biggest rating out there. - I installed this BEAST of a filter (spring of 2016) and it DOES have to be installed at a slight angle to get it to fit inside the Dinan CAI metal shroud cover

I read on another Bimmer forum that the K&N is an exact replica in regards to sizing of the Dinan's d403-0410 filter. EDIT: they did use the same dimensions. See above.
I confirmed measurements. Since this is true, then the other filters I've listed are ALSO very close measurement options. with the AEM brand being the widest filter base and top, then the AFE brand then K&N/Dinan filters being narrowest (5.375" @ base, 4.375" at top). the AFE ones I've listed have more filter membrane as they have an inverted top instead of rubber sealed flat top, and therefore more air cleaning/intake.

just a comment on the Dinan CAI metal box/shroud VS the metal AFE stage 1 shroud...
the AFE takes advantage of the factory air cowl and allows air from this to be cowl directed towards the air filter (see red circle in pic). The Dinan air box does NOT allow airflow from the factory air cowl to enter the metal box. I'm sure you can find a way though to get the air into it somehow...but would require modification of the Dinan box.
Attached Images
I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

'91 850i
'05 X5 4.4i

Last edited by Clockwork; 05-17-2021 at 04:15 PM.
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