aFe Momentum ST cold air intake system with a one-piece sealed cross-linked polyethylene housing that has a built-in air scoop and dual quad slots aimed at the turbochargers, plus dyno-tuned driver and passenger side intake tubes. Two 11 in tall 360 degree radial flow filters use three-layer oil-free synthetic Pro DRY S media. It flows 27% more air than the factory intake and is rated at 16 hp and 18 lb-ft over stock.
Specifications
| Type | Cold Air Intake System |
| Series | Momentum ST |
| Filter Media | Pro DRY S, three-layer oil-free synthetic, washable and reusable |
| Construction | One-piece sealed XLPE housing with built-in air scoop; driver and passenger side XLPE intake tubes; stainless clamps |
| Filter | Two 11 in tall 360 degree radial flow filters |
| Gains | +16 hp, +18 lb-ft; 27% more airflow than the factory intake |
| Install | Replaces the factory airbox; both factory MAF sensors move to the aFe tubes |
| What's in the Box |
|
| Fitment Notes | X5 M (F85) 2015-2018 and X6 M (F86) 2015-2019 with the 4.4L twin-turbo S63 V8 |
| Replacement Filter | 21-90109-MA (Pro DRY S, pair) |
| Engine | V8-4.4L (tt) S63 Engine |
| Filter Color | Gray |
| Hardware Included | Yes |
| Air Flow Gain | 27 Percent |
| Air Box Type | Closed |
| Heat Shield Included | Yes |
| Tune Required | No |
| Warranty | 2 years on components (original owner) |
| Part Number | 50-40045D |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2018 | BMW | X5 | M |
| 2015-2019 | BMW | X6 | M |
Documents: Installation Instructions (PDF) | Airflow Chart | Dyno Chart | Filter Cleaning Instructions
Which years of X5 M does it fit?
- The 2015-2018 X5 M and the 2015-2019 X6 M with the 4.4L twin-turbo V8 (S63).
How many filters does it use?
- Two. The replacement filters are sold as a pair.
How do I service the filter?
- The Pro DRY S filter is washable and reusable; cleaning instructions are linked under Documents. The replacement filter is part number 21-90109-MA.
What comes in the box?
- Two filters, housing, driver and passenger side tubes, rubber housing and tube mounts and screws.
Shipping
- Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Special order items follow a lead time we confirm with you individually before the order is committed.
- Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
- Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
- Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
- Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
- Product images may be representative. The SKU and specifications in the listing are what ships.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Returns & Refunds · Warranty






