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Description
2009-2016 BMW Z4 Direct-Fit Catalytic Converter 21-169 MagnaflowOverview: Keep the check engine light off with MagnaFlow OEM Grade Federal EPA Compliant Direct Fit Catalytic Converter 21 169. With features including free flowing mandrel bent tubing and highly corrosion resistant, stainless steel construction, easily install this spun body converter yourself using the proper tools, no cutting or welding required. MagnaFlow's state of the art metrology department uses the latest 3D scanning systems during research
Overview:
Keep the check engine light off with MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 21-169. With features including free-flowing mandrel-bent tubing and highly corrosion resistant, stainless steel construction, easily install this spun body converter yourself using the proper tools, no cutting or welding required. MagnaFlow's state-of-the-art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE spun body design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low-mass design also allows for greater thermal efficiency.
This direct-fit catalytic converter is designed specifically for the 2009-2016 BMW Z4 and interchanges with OE part 18 30 7 647 040. The included gaskets & hardware reduce the possibility of a leaking seal while avoiding the need to reuse corroded factory parts for installation.
Note : Not For Sale in California
| Brand | Interchange Part Number |
|---|---|
| BMW | 18 30 7 647 040 |
| BMW | 18307647040 |
| BMW | 18 30 7 647 040 |
| BMW | 18307647040 |
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 2009 - 2016 | BMW | Z4 | 3L/L6 |
Specs:
| Air Tube Adaptable | No |
|---|---|
| Sensor Port Count | 2 |
| Inlet Attachment | Clamp-On |
| Overall Length (In.) | 21.5 |
| Mounting Hardware Included | Yes |
| Type | Direct-Fit |
| Subtitle | Federal / EPA Compliant |
| Heat Shield Attached | No |
| Title | OEM Grade Direct-Fit |
| Series | OEM Grade |
| Clamp Included | No |
| Outlet Attachment | Bolt-On |
| Oxygen Sensor Location | Pre and Post Converter |
| Material | Stainless Steel |
| Hangers Included | No |
| Finish | Stainless Steel |
| Converter Quantity | 1 |
| Substrate Material | Ceramic |
| Main Piping Diameter | 2.5 |
| Gasket Included | Yes |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
Review After Using on 3 Different Cars over 3 years
Size: 1 Count (Pack of 1)
Cerakote Headlight Restoration Kit : After Using on 3 Different Cars over 3 years
This is my second time purchasing the Cerakote Headlight Restoration Kit, and I’ve now used it across three different vehicles. At this point, I feel comfortable saying this product genuinely works when used correctly.
Before trying this kit, I considered replacing my headlights entirely. The cheapest replacement set I found was around $150 just for the parts. Installation would have required removing the grille, bumper, and other components, which adds time and complexity. For an older vehicle, that didn’t make financial sense.
Instead, I chose to restore the original headlights.
Cost and Value
My first package cost me $17, and I restored two cars with that single kit ( about 9$ per pair). That alone made it worth it.
For under $20:
I restored two separate vehicles
Avoided buying new headlight assemblies
Avoided removing the bumper and grille
Compared to a $150+ replacement plus labor, the savings are significant.
Durability 1 year+ under direct Cali sunlight (currently on year 2 and still good)
First Car – Learning the Process
The first time I used the kit, my results were decent but not perfect. That was mainly because I didn’t fully understand how sanding and polishing actually work. ( this reoxidized fastest under 8 months, but it was mostly my fault)
I didn’t initially realize:
The headlight needs to stay wet during sanding
Oxidation must be completely removed before applying clear coat
Even pressure matters/ 50% overlap coverage when appling ceramic
Once I understood that sanding is the most important step, everything improved.
Second Car (beater) Major Improvement
The second vehicle was heavily oxidized and yellowed. I used the remaining material from that same $17 kit and restored it completely.
The clarity difference was dramatic. It looked close to factory condition, and night visibility noticeably improved. That was when I realized the product itself is solid; the key is proper technique.
Third Car ; Recent purchase
By the third car, the process felt straightforward. I followed the instructions carefully, kept the surface wet while sanding, and applied the clear coat evenly in one smooth pass.
The final result was clear, glossy, and uniform. No haze, no streaking.
Durability
On my first vehicle, the restoration lasted close to a year perfectly( I sold that car this year and it still had clear headlights), and that car was parked outside in direct sun most days. For a DIY kit at this price point, that level of durability is impressive.
Final Thoughts
I seriously considered spending $150 on replacement headlights( this was cheapest ) and dealing with removing body panels. Instead, I spent $17 and restored two cars.
Now having used it on three vehicles, I can say this kit is effective, cost-efficient, and worth the time if you follow the process properly. It does require effort and patience, but the results justify it.
I would purchase it again.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
works as advertised!
Size: 1 Count (Pack of 1)
I purchased this kit to renew the headlights on my 2016 Nissan Frontier pick-up. The headlights had become slightly oxidized and dull -- not that bad but it was bothering me and for the price of the kit I figured it was worth the effort to attempt to renew them.
All I can say is -- WOW, what a difference. The end result looked like new -- clean, brilliant and bright.
Read the directions (2 or 3 times) and follow them EXACTLY. Total time for me from opening the kit to being done was about 2 hours and I was taking my time.
This kit is different in that the final step applies a UV resistant coating which really makes the glass super transparent.
Great investment in the time and money. I can't stop admiring my new (old) headlights!
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Incredible Results! The "Z-Line" is Back!
Size: 1 Count (Pack of 1), Size: 1 Count (Pack of 1)
I’ve tried a few "wipe-on" fixes in the past, but the CERAKOTE® Ceramic Headlight Restoration Kit is in a completely different league. If you are tired of hazy, yellowed lenses and weak nighttime visibility, look no further.
📖 Instructions & Ease of Use
The first thing that stood out was the clarity of the instructions. The kit breaks everything down into a simple, step-by-step process. Even if you aren't a "car person," the directions are foolproof. They don't just tell you what to do; they explain why each step matters, which gave me the confidence to get the job done right the first time.
✨ Restoration Effectiveness
As you can see in my Before and After photos, the transformation is night and day. My headlights went from a dull, oxidized yellow to a factory-fresh, crystal-clear finish. It didn't just "clean" them—it completely rejuvenated the plastic.
🔦 The Real Test: Light Output & Beam Pattern
The most impressive part isn't just how the car looks, but how it performs at night. I’ve included a photo of my car parked against a wall in the dark to show the comparison:
Passenger Side (Restored): You can see a sharp, distinct cutoff line and the perfect "Z-line" pattern. The light is focused exactly where it needs to be on the road.
Driver Side (Not Restored yet): The light is completely distorted. There is no cutoff, just a messy blob of light that scatters everywhere, likely blinding oncoming traffic while providing less actual visibility for me.
Final Verdict
This kit doesn't just make your car look better; it’s a genuine safety upgrade. Seeing that crisp Z-line back on the wall proves that the clarity is internal as well as external. Highly recommended!
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Like it came from the factory
Color: 2024-2025 Black
The texture and color matches the factory interior and the shape and size of the handle is a mirror image of the passenger handle from the factory. Installation is quick and easy - it takes only five minutes. Great product!
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Reviewed in the United States on April 17, 2026
★★★★★ 5
JUST RIGHT
Color: 2024-2025 Black
PERFECT FIT WORKS AS ADVERTISED
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Reviewed in the United States on May 27, 2026