aFe Momentum GT cold air intake system with a one-piece sealed cross-linked polyethylene housing, a large sight window, an aluminum heat shield panel and a dyno-tuned XLPE intake tube. It fits with the factory strut brace in place. The 6 in tall inverted 360 degree radial flow filter uses three-layer oil-free synthetic Pro DRY S media. It flows 20% more air than the factory intake (245 CFM at 7 in H2O) and is rated at 9 hp and 16 lb-ft over stock.
Specifications
| Type | Cold Air Intake System |
| Series | Momentum GT |
| Filter Media | Pro DRY S, three-layer oil-free synthetic, washable and reusable |
| Construction | One-piece sealed XLPE housing with large sight window and aluminum heat shield panel; dyno-tuned XLPE tube; stainless clamps |
| Filter | 6 in tall 360 degree radial flow, inverted top, 4-1/2 in flange |
| Gains | +9 hp, +16 lb-ft; 20% more airflow than the factory intake (245 CFM at 7 in H2O) |
| What's in the Box |
|
| Fitment Notes | 3.0L turbo 6-cylinder (B58) only. Fits with the factory strut brace |
| Replacement Filter | 21-91144 (Pro DRY S) |
| Engine | L6-3.0L (t) B58 Engine |
| Filter Color | Gray |
| Hardware Included | Yes |
| Air Flow Gain | 20 Percent |
| Air Box Type | Closed |
| Heat Shield Included | Yes |
| Tune Required | No |
| Warranty | 2 years on components (original owner) |
| Part Number | 50-70073D |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2017-2023 | BMW | 540i | Base |
| 2017-2023 | BMW | 540i xDrive | Base |
| 2016-2022 | BMW | 740i | Base |
| 2017-2022 | BMW | 740i xDrive | Base |
| 2020-2026 | BMW | 840i | Base |
| 2020-2026 | BMW | 840i Gran Coupe | Base |
| 2020-2026 | BMW | 840i xDrive | Base |
| 2020-2026 | BMW | 840i xDrive Gran Coupe | Base |
| 2018-2019 | BMW | X3 | M40i |
| 2019 | BMW | X4 | M40i |
Documents: Installation Instructions (PDF) | Airflow Chart | Dyno Chart | Filter Cleaning Instructions
Does it fit the 530i?
- No. It is made for the 3.0L turbo 6-cylinder 540i, 740i, 840i and X3 / X4 M40i.
Does it clear the factory strut brace?
- Yes. It fits with the factory strut brace and needs no modification.
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 21-91144.
What comes in the box?
- Filter, housing, intake tube, silicone bellows coupling, clamps, aluminum fittings, grommet, auxiliary plug 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






