Selected Filters

Replacement Parts for HLY-550-1221

Holley Terminator X Engine Management Systems 550-1221

Not Yet Reviewed

Part Number: HLY-550-1221

Estimated Ship Date from Texas: Monday 10/19/2026

$2,049.95

Back to Part Detail

Replacement Parts

Filters

Results 1 - 1 of 1

Wiring Harnesses. Holley EFI, Replacement, Wideband O2 Adapter Harness, Terminator EFI Systems, Pre-Terminated, Plug-and-Play, Each

Part Number: HLY-558-463

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 10/19/2026 if shipped by air

...Loading

Estimated Ship Date: Monday 10/19/2026 if shipped by air

This is a custom order part. You can order this part by Contacting Us.

Call now to speak with a sales specialist!

1-800-230-3030