Want even more power and higher performance from your FICM? A 58V upgrade provides better overall power and improves cold starts. The additional voltage increases engine performance and minimizes misfires. It also creates a stronger pull on the spool valve and advances the injection timing, which leads to better performance and fuel economy. Grizzly FICMs utilize proprietary modifications that make the 58V upgrade reliable and free of error codes.

CORE RETURN OPTIONS - You have 3 options for core return: EXPRESS, CORE SWAP or NO CORE.

1) EXPRESS: We will immediately send you a Grizzly FICM and you agree to send us your core within 30 days. We will temporarily charge your card $250 for a core charge and will refund the $250 core charge if we receive the core within 30 days. *It is your responsibility to send us your core.

Express Core Return Terms:
- If we receive the core within 30 days, we will issue a full refund of $250
- If we receive the core between 31 and 59 days, the refund will be reduced to $200.
- After 60 days, no core refund will be issued.

2) CORE SWAP: There is no core charge involved with this option. We must receive your core BEFORE we ship your FICM. We will send you a Grizzly FICM once we have received your FICM core or a tracking number.

3) NO CORE: You don’t send us a core and agree to pay a core charge of $250.

Send your FICM core to:
Grizzly Performance FICMS
1816 Rickman Monterey Hwy
Rickman, TN 38580

*Please ship your FICM core carefully. Use proper packing material, etc. If the core is not packaged carefully and the connector is broken, we will deduct $75 from your core return.

*If you choose EXPRESS as a Core Return Option, we will send you a Core Return Form when we send your new FICM. Please include the Core Return Form when you send in your core. We recommend you use the same box and packing material.

For more information on core returns go here

IMPORTANT INFORMATION ABOUT THE 58V MODIFICATION - How to Check the Output Voltage