The MagnaFlow 49766 is an OEM Grade Federal/EPA compliant direct-fit front catalytic converter for the N54 twin turbo inline six, replacing OE 18 30 7 553 594, the primary converter for cylinders 1 to 3. It has a spun body flanged at both ends, a 21.5 inch overall length and two sensor ports for pre and post converter O2 sensors, and ships with a flange gasket and mounting hardware. It is built to Federal/EPA emissions standards for OBDII vehicles and is not legal for sale or use in California, Colorado or New York. Mandrel-bent 16 gauge 409 stainless tubing and 308 stainless MIG welds replicate OEM flow and geometry, and it installs with hand tools, with no cutting or welding.
Specifications
| Type | Direct-fit catalytic converter, OEM Grade Federal/EPA compliant |
| Position | Front, cylinders 1-3 (Bank 1) |
| Emissions | Federal/EPA; not legal in CA, CO or NY |
| Engine | N54 3.0L I6 twin turbo |
| Body | Spun |
| Inlet / Outlet | Flanged |
| Overall Length | 21.5 in |
| O2 Ports | 2 (pre and post converter) |
| Material | 16 gauge 409 stainless steel, ceramic substrate |
| Included | 1 flange gasket, 3 bolts, 3 flat washers, 2 split lock washers, 2 nuts |
| Quantity | 1 |
| Part Number | 49766 |
| OE Replacement | 18 30 7 553 594 |
| Warranty | 5 years/50,000 miles construction, 25,000 miles emissions (limited) |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2010 | BMW | 135i | Base |
| 2007-2010 | BMW | 335i | Base |
| 2007-2008 | BMW | 335xi | Base |
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
