This is MagnaFlow's OEM Grade Federal and EPA compliant direct fit converter, a spun body assembly on a ceramic substrate with 16 gauge 409 stainless steel mandrel bent tubing that bolts into the factory location without cutting or welding. The single laser fusion weld on the spun body cuts the number of potential leak paths, and the compact low mass design carries less thermal inertia so the converter reaches operating temperature quickly. It runs 44 in overall with a 3 in inlet and a 2.5 in outlet, and it interchanges with OE parts 166 490 79 00 and 166 490 85 14. Note the emissions grade: this unit meets Federal and EPA requirements and is not legal for sale or installation in California, Colorado or New York.
Specifications
| Type | Direct fit catalytic converter, spun body, ceramic substrate (MagnaFlow OEM Grade) |
| Position | Underbody |
| Material | 16 gauge 409 stainless steel tubing, 410 stainless hangers, 308 stainless MIG welds |
| Inlet Diameter | 3 in |
| Outlet Diameter | 2.5 in |
| Overall Length | 44 in |
| Emissions | Federal and EPA compliant. Not legal for sale or installation in California, Colorado or New York |
| OEM Replacement | 166 490 79 00, 166 490 85 14 |
| Included | Gaskets and hardware. Clamps and inlet gaskets or inlet mounting hardware are not included |
| Warranty | 25,000 mile emissions warranty, 5 year construction warranty |
| Part Number | 21-551 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2016 | Mercedes-Benz | GL450 | 4Matic |
| 2016-2017,2019 | Mercedes-Benz | GLE400 | 4Matic |
| 2017-2019 | Mercedes-Benz | GLE43 AMG | 4Matic |
| 2016 | Mercedes-Benz | GLE450 AMG | 4Matic |
| 2017-2019 | Mercedes-Benz | GLS450 | 4Matic |
| 2015 | Mercedes-Benz | ML400 | 4Matic |
Shipping
- Orders placed before 3 PM ET 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
