- Description
- Reviews
- Shipping and Refund
Bundle and SAVE! Choose your color combo to dress up your engine bay!
The Precision Raceworks Billet Engine Cap Set is a functional and stunningly stylish way to add a nice touch to any engine bay!
These caps come in three color options so there is always a color that will work for you! Black with Billet, Black with Blue, and the Stealth series (all black).
Many people don't realize it but the OEM caps have a pressure release valve built into them. Often times aftermarket companies don't know this either or just don't care. But our team cares about proper function just as much as we care about the appearance in every product we design. For pressure relief, our caps incorporate the OEM internals, so you get all the functionality of the original caps, ensuring a safe and reliable system in place.
These caps offer superior style and performance-grade components that replace the factory cap not just cover it up. The durable billet aluminum construction provides long-lasting protection and dependability that will upgrade your engine bay for years to come!
PLEASE NOTE:
These do require assembly and swapping the pressure relief valves from your old caps to your new billet caps.
Fitment Note
If your primary expansion tank cap looks like this:

You will need to purchase a different coolant expansion tank cap to use as the donor cap.
BMW Part number 17117639021

- Weight: 1.1 lbs
- Material type: Anodized Aluminum
- O-Ring Material: Viton
- Retains OEM Pressure Relief: YES
Fitments
- Bmw M3 2021 to 2024
- Bmw M340i Sedan 2019 to 2024
- Bmw M340ix Sedan 2019 to 2024
- Bmw M4 2021 to 2024
- Bmw M440i 2021 to 2024
- Bmw M440ix 2021 to 2024
Handling
Orders shipped directly from our warehouse are usually processed the same business day if placed before 12 PM MST, and tracking details are provided within 1 business day.
For drop-shipped items, processing times may vary depending on the manufacturer, typically 3–5 business days. Tracking updates may take longer in such cases.
Expedited shipping applies only once the item is ready to ship.
Return
You have 30 days after receiving your order to request a return. Items must be unused, in original packaging, and include proof of purchase. Customers are responsible for covering the return shipping costs.
To start a return, email us at sales@palenonperformance.com. Returns sent without approval will not be accepted.
You can request a return directly from your account by selecting the return option on your order page. Here is the URL: https://shopify.com/55092379855/account/orders
Non-returnable items:
- Burger Motorsports (BMS) products
- Used items
- Air Intakes
- Hazardous materials, flammable liquids, or gases
- Discounted items and gift cards other than "PALENON PERFORMANCE" brand
Exchanges
Return the item and place a new order once approved.
Refunds
Approved refunds are issued to the original payment method. A restocking fee is 20% will be applied. Processing time depends on your bank or payment provider. The original shipping cost will not be refunded.
Cancellations
Canceled orders are subject to a 5% merchant fee (8% for Shop Pay installments). Custom, specialized items or pre-order items canceled within their lead time are also subject to this fee. Will also incur a 10% restocking fee.
Damaged or incorrect items
Inspect your order upon arrival and contact us immediately for assistance. If the wrong part was ordered, customer covers return shipping.
Disputes / Chargebacks
Our legal team is fully prepared to take stringent action against you for filing a baseless claim and initiating a fraudulent chargeback. This will lead to civil or criminal proceedings, which would require you to engage with our attorneys in our jurisdiction.
It is crucial to understand that filing a false chargeback is a serious offense, punishable by substantial fines or imprisonment. Potential penalties for fraudulent chargebacks can include one to three years in prison and fines ranging from $1,000 to $10,000. We treat all chargebacks with the utmost seriousness, regardless of the amount, as this is classified as a felony.
We will compose all necessary information to send your account to a collections agency and request that you be served once our lawyers organize the evidence and file a case against you.
Bundle and SAVE! Choose your color combo to dress up your engine bay!
The Precision Raceworks Billet Engine Cap Set is a functional and stunningly stylish way to add a nice touch to any engine bay!
These caps come in three color options so there is always a color that will work for you! Black with Billet, Black with Blue, and the Stealth series (all black).
Many people don't realize it but the OEM caps have a pressure release valve built into them. Often times aftermarket companies don't know this either or just don't care. But our team cares about proper function just as much as we care about the appearance in every product we design. For pressure relief, our caps incorporate the OEM internals, so you get all the functionality of the original caps, ensuring a safe and reliable system in place.
These caps offer superior style and performance-grade components that replace the factory cap not just cover it up. The durable billet aluminum construction provides long-lasting protection and dependability that will upgrade your engine bay for years to come!
PLEASE NOTE:
These do require assembly and swapping the pressure relief valves from your old caps to your new billet caps.
Fitment Note
If your primary expansion tank cap looks like this:

You will need to purchase a different coolant expansion tank cap to use as the donor cap.
BMW Part number 17117639021

- Weight: 1.1 lbs
- Material type: Anodized Aluminum
- O-Ring Material: Viton
- Retains OEM Pressure Relief: YES
Fitments
- Bmw M3 2021 to 2024
- Bmw M340i Sedan 2019 to 2024
- Bmw M340ix Sedan 2019 to 2024
- Bmw M4 2021 to 2024
- Bmw M440i 2021 to 2024
- Bmw M440ix 2021 to 2024
Handling
Orders shipped directly from our warehouse are usually processed the same business day if placed before 12 PM MST, and tracking details are provided within 1 business day.
For drop-shipped items, processing times may vary depending on the manufacturer, typically 3–5 business days. Tracking updates may take longer in such cases.
Expedited shipping applies only once the item is ready to ship.
Return
You have 30 days after receiving your order to request a return. Items must be unused, in original packaging, and include proof of purchase. Customers are responsible for covering the return shipping costs.
To start a return, email us at sales@palenonperformance.com. Returns sent without approval will not be accepted.
You can request a return directly from your account by selecting the return option on your order page. Here is the URL: https://shopify.com/55092379855/account/orders
Non-returnable items:
- Burger Motorsports (BMS) products
- Used items
- Air Intakes
- Hazardous materials, flammable liquids, or gases
- Discounted items and gift cards other than "PALENON PERFORMANCE" brand
Exchanges
Return the item and place a new order once approved.
Refunds
Approved refunds are issued to the original payment method. A restocking fee is 20% will be applied. Processing time depends on your bank or payment provider. The original shipping cost will not be refunded.
Cancellations
Canceled orders are subject to a 5% merchant fee (8% for Shop Pay installments). Custom, specialized items or pre-order items canceled within their lead time are also subject to this fee. Will also incur a 10% restocking fee.
Damaged or incorrect items
Inspect your order upon arrival and contact us immediately for assistance. If the wrong part was ordered, customer covers return shipping.
Disputes / Chargebacks
Our legal team is fully prepared to take stringent action against you for filing a baseless claim and initiating a fraudulent chargeback. This will lead to civil or criminal proceedings, which would require you to engage with our attorneys in our jurisdiction.
It is crucial to understand that filing a false chargeback is a serious offense, punishable by substantial fines or imprisonment. Potential penalties for fraudulent chargebacks can include one to three years in prison and fines ranging from $1,000 to $10,000. We treat all chargebacks with the utmost seriousness, regardless of the amount, as this is classified as a felony.
We will compose all necessary information to send your account to a collections agency and request that you be served once our lawyers organize the evidence and file a case against you.



