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6 To power our X302’s fuel injection, we’re using Ford Racing’s EFI retrofit harness, PN M-12071-A50. This harness is similar to the stock Fox Mustang 5.0L harness, but has been trimmed down to the essentials, removing EGR, and other non-essential items for classic retrofits. The harness requires a 2.5-inch hole to be cut for the ECM wiring to pass through to the passenger compartment. Carefully pass the ECM connector, relay box connector, and loose wires that need to be connected to the ignition switch through the hole.