This OEM Grade converter drops into the factory downstream location using the proper tools with no cutting or welding. The spun body replicates the OE design so a single laser fusion weld replaces the seams where leaks usually start, and the compact, low mass shape improves thermal efficiency. It is built from 16 gauge 409 stainless tubing with 308 stainless MIG welds over a ceramic substrate, measures 20.625 in overall on a 5 in round body, and uses 2 in flanges at both ends. Gaskets and hardware are included, and it interchanges with OE part 18150-51M-A50.
Specifications
| Type | Spun body direct-fit catalytic converter (MagnaFlow OEM Grade) |
| Position | Secondary (downstream) |
| Material | 16 gauge 409 stainless steel tubing, ceramic substrate |
| Inlet | 2 in flange |
| Outlet | 2 in flange |
| Body Size | 5 in diameter round, 5.125 in body length |
| Overall Length | 20.625 in |
| Sensor Ports | 1 (pre converter) |
| Included | Crush ring gasket, donut gasket, 3 bolts, 2 nuts |
| OEM Replacement | 18150-51M-A50 |
| Series | OEM Grade |
| Finish | Stainless |
| Body Type | Spun |
| Inlet Type | Flange |
| Clamps Included | No |
| Hangers Included | No |
| Legality | Not legal for sale or installation in California, Colorado or New York. |
| Quantity | 1 |
| Part Number | 21-979 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2016-2022 | Honda | HR-V | EX |
| 2016-2022 | Honda | HR-V | EX-L |
| 2016-2022 | Honda | HR-V | LX |
| 2019-2022 | Honda | HR-V | Sport |
| 2019-2020 | Honda | HR-V | Touring |
Which vehicles does this fit?
- It fits the Honda HR-V 2016-2022. The full year, make, model and submodel list is in the fitment table on this page. This part is for the secondary (downstream) position.
What comes in the box?
- Crush ring gasket, donut gasket, 3 bolts, 2 nuts.
Is it legal in my state?
- Not legal for sale or installation in California, Colorado or New York.
What is it made of?
- 16 gauge 409 stainless steel tubing, ceramic substrate.
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






