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Air filters for the 6.6L Duramax’s various generations (LB7 through L5P) run well above what a typical gas-car air filter costs, because of the larger media area and heavier-duty construction diesel intakes need — expect roughly $50-$100 for a genuine option here, not the $15-$20 a gas-engine filter might cost. This is also a narrower category than most of our roundups, so we’re covering six verified, cross-referenced options.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | ACDelco Duramax Air Filter (A2947C / A3087C) | $50-$65 | Amazon |
| 2 | WIX 49184 Heavy Duty Corrugated Air Filter | $55-$72 | Amazon · eBay |
| 3 | Donaldson P610875 PowerCore | $60-$86 | Amazon |
| 4 | Fleetguard AF27860 | $51-$61 | Amazon |
| 5 | S&B Filters Intake Replacement Filter (KF-1035/KF-1035D) | $69 | Amazon |
| 6 | aFe Power Pro-Guard 7 (Magnum FLOW) | $85-$97 | Amazon |
The picks, in detail
ACDelco Duramax Air Filter (A2947C / A3087C)
GM’s own-brand Duramax air filter, the safe default match for factory airbox fitment on LB7 through LML-era trucks.
- GM cross-referenced OEM part numbers by generation
- Direct factory airbox fitment, no modification
- Paper media rated to OEM flow spec
- Sold individually per generation
- Exact OEM fitment, zero guesswork
- Backed by GM parts warranty
- No flow advantage over stock — a like-for-like replacement, not an upgrade
- Priced above typical gas-engine filters due to the diesel-specific media
WIX 49184 Heavy Duty Corrugated Air Filter
Widely cross-referenced heavy-duty filter (also sold as NAPA 9184) built to the same Mann+Hummel spec as the GM OEM part.
- Heavy-duty corrugated media
- Cross-references to Donaldson P610875 and Fleetguard AF27860
- Round/obround housing fit for the factory airbox
- Sold individually
- Same manufacturing group as ACDelco’s OEM filter at a comparable or lower price
- Very widely stocked at parts chains
- Standard paper media, not a high-flow or washable design
- Price varies a lot by retailer, worth shopping around
Donaldson P610875 PowerCore
Donaldson’s PowerCore primary filter, the same trusted heavy-equipment filtration brand used across commercial diesel fleets.
- PowerCore pleated media for higher dust-holding capacity
- Primary round filter for the factory Duramax airbox
- Commercial/fleet-grade construction
- Cross-references to WIX 49184 and Fleetguard AF27860
- Donaldson’s fleet-grade reputation for dust-holding capacity
- A step up in build quality over basic paper filters at a modest premium
- Costs more than the WIX/ACDelco equivalents for the same fitment
- Overkill filtration capacity for light-duty daily driving
Fleetguard AF27860
Cummins-Fleetguard’s version of the same fitment, popular with owners who already run Fleetguard fuel/oil filters and want one brand across the truck.
- Same physical fitment as the Donaldson P610875/WIX 49184
- Fleetguard’s commercial-grade filtration media
- Round primary filter housing
- Widely stocked at heavy-truck parts suppliers
- Good middle-ground price between WIX and Donaldson
- One-brand consistency for owners already buying Fleetguard fuel filters
- Functionally near-identical to the WIX/Donaldson cross-references, no unique performance edge
- Less common at general auto parts stores than at diesel/fleet suppliers
S&B Filters Intake Replacement Filter (KF-1035/KF-1035D)
The dry replacement filter for S&B’s own cold-air intake systems, also usable as a standalone factory-airbox upgrade on some Duramax generations.
- ISO 5011-tested 99.72% filtration efficiency, published by S&B
- Dry (non-oiled) media, no MAF-fouling risk some oiled filters carry
- Sized for S&B intake housings, LB7-LMM generations
- Washable and reusable design
- Independently published efficiency numbers most competitors don’t disclose
- Reusable, lower long-term cost than replacing paper filters
- Sized for S&B’s own intake housing — confirm fitment if running the stock airbox
- Some diesel-forum owners report occasional fitment or sealing complaints
aFe Power Pro-Guard 7 (Magnum FLOW)
aFe’s oiled Pro-Guard 7 media filter, sold both as a standalone factory-airbox drop-in and as the replacement filter for aFe’s own intake kits.
- Pro-Guard 7 oiled synthetic media rated to outflow stock paper by up to 17%
- Reusable and washable design
- Sized for the stock airbox on multiple Duramax generations
- Serviceable rather than disposable
- Genuine flow improvement over stock paper filters, not just a marketing claim
- Reusable, cuts long-term filter spend
- Oiled media carries a small MAF-fouling risk if over-oiled during service
- Priced at the top of this list
Buying tips
- Confirm your exact Duramax generation (LB7, LLY, LBZ, LMM, LML, L5P) before ordering — filter dimensions changed across the model’s life and a wrong-size filter won’t seal in the airbox.
- Diesel air filters run well above typical gas-engine filter prices ($50-$100+ is normal here) because of the larger media area and heavier-duty construction diesel intakes need — that’s not a markup, it’s the real market.
- If you switch to a reusable oiled filter (S&B, aFe), follow the manufacturer’s oiling instructions exactly; over-oiling is the most common cause of MAF sensor contamination complaints.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.