SE Special Edition Tuning Kit – Fits MerCruiser 454 & 502 Magnum MPI Engines (Replaces 0172806)
SE Special Edition Tuning Kit – Fits MerCruiser 454 & 502 Magnum MPI Engines (Replaces 0172806) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
SE Special Edition Tuning Kit – Fits MerCruiser 454 & 502 Magnu...
Product Details
This SE Special Edition Tuning Kit – Fits MerCruiser 454 & 502 Magnum MPI Engines (Replaces 0172806) is a performance upgrade for MerCruiser Magnum Multi-Port Injection (MPI) series engines, specifically the 454 and 502 models. It is engineered to increase airflow by up to 20% for a noticeable boost in performance.
This kit serves as a direct replacement for MerCruiser part 0172806, Sierra 18-5003, and EMP 300-05003.
- Features a simple bolt-on installation process.
- Includes a high-flow K&N air filter element and an adjustable fuel pressure regulator.
- Designed for gasoline-fueled marine engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 0172806 |
| Sierra | 18-5003 |
| EMP | 300-05003 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this kit is specifically designed for the 454 and 502 Magnum MPI models.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | 454 Magnum MPI | 4-Stroke | 0172806 | |
| MerCruiser | 502 Magnum MPI | 4-Stroke | 0172806 |
Technical Specs
- Product Type
- Performance Tuning Kit
- Installation
- Bolt-on
- Fuel Type
- Gasoline
- Connection
- Direct fit to MerCruiser Magnum MPI engines
- Dimensions
- 7.13" x 6.0" x 1.63"
- Fitting Type
- High velocity air inlet adapter with K&N clamp-on style filter
- Working Pressure
- Adjustable 25–65 PSI
- Other Technical Attributes
- Increases airflow by up to 20%
What’s in the Box
- 1 x "SE" Special Edition flame arrestor with K&N clamp-on style filter element
- 1 x High velocity air inlet adapter
- 1 x Flow Command adjustable fuel pressure regulator
Installation Notes
- Ensure the engine is off and has cooled completely. Disconnect the negative battery terminal as a safety precaution.
- Properly relieve the fuel system pressure according to your engine's official service manual to prevent fuel spray.
- Carefully remove the original flame arrestor assembly and its housing.
- Install the new high velocity air inlet adapter where the original housing was located.
- Securely attach the new K&N clamp-on style filter element onto the adapter.
- Locate the stock fuel pressure regulator and replace it with the new Flow Command adjustable regulator.
- Adjust the fuel pressure as per the kit's instructions or your specific performance tuning goals (within the 25–65 PSI range).
- Reconnect the battery. Before starting the engine, double-check all fittings and connections for tightness and inspect for any fuel leaks.
Troubleshooting & FAQ
Will this kit fit my specific engine year?
This kit is designed for all MerCruiser 454 and 502 Magnum MPI series engines. It is a direct replacement for OEM part number 0172806. We recommend verifying your engine's part number to ensure a perfect match.
Is any special tuning required after installation?
Yes. The kit includes an adjustable fuel pressure regulator. To achieve optimal performance and take full advantage of the increased airflow, you will need to set the fuel pressure according to your engine's requirements, typically within the 25–65 PSI range.
How does this kit improve performance over the stock parts?
This kit enhances engine performance by replacing the restrictive factory air intake with a high-flow K&N filter and a high-velocity adapter, increasing airflow by up to 20%. The adjustable fuel regulator allows you to fine-tune the fuel supply to match this increased airflow, optimizing the air-fuel mixture for more power.
What are the signs my existing flame arrestor or fuel regulator is failing?
A clogged flame arrestor may cause poor acceleration, engine hesitation, or difficulty starting. A failing fuel pressure regulator can lead to a rich or lean fuel condition, resulting in rough idling, black exhaust smoke, poor fuel economy, or a noticeable smell of gasoline.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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