This is the front primary converter for the 2.0T, a 65 in underbody assembly that brings the downpipe with it so one part covers both. The spun body replicates the OE design and installs with no cutting or welding. The tubing is 16 gauge 409 stainless mandrel bent to hold the OE flow geometry, joined by a single laser fusion weld that leaves fewer seams to leak, with 308 stainless MIG welds and OE-sized barbed 410 stainless hangers to keep noise and vibration down. Two oxygen sensor ports cover the pre and post converter positions, a Torca AccuSeal clamp spreads clamping force through a full 360 degrees so the pipe does not distort, and the part is CARB compliant under Executive Order D-193-200 for legal installation in California and the CARB restricted states. A flange gasket is included.
Specifications
| Type | Direct-fit catalytic converter (MagnaFlow California Grade) |
| Position | Front, primary (first converter), underbody mounted |
| Emissions Compliance | California CARB compliant, Executive Order D-193-200. New York certified |
| Body Type | Spun |
| Inlet | Flange |
| Outlet | Pipe connection |
| Material | 16 gauge 409 stainless steel tubing, stainless steel body, 308 stainless steel MIG welds |
| Substrate | Ceramic |
| Overall Length | 65 in |
| Heat Shield | Not attached |
| Oxygen Sensor Ports | 2, pre and post converter |
| Hangers | OE-sized barbed, 410 stainless steel |
| Includes | 1 flange gasket, 1 Torca AccuSeal clamp, clamps and hangers |
| OEM Replacement | 5N0 254 500 NX, 5N0 254 500 SX |
| Quantity | 1 |
| Part Number | 551408 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015 | Audi | Q3 | Premium Plus |
| 2015 | Audi | Q3 | Prestige |
| 2015 | Audi | Q3 Quattro | Premium Plus |
| 2015 | Audi | Q3 Quattro | Prestige |
| 2014-2015 | Volkswagen | Tiguan | R-Line |
| 2009-2015 | Volkswagen | Tiguan | S |
| 2009-2015 | Volkswagen | Tiguan | SE |
| 2009-2015 | Volkswagen | Tiguan | SEL |
| 2010 | Volkswagen | Tiguan | Wolfsburg Edition |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- 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-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
