Roush includes a FedEx mailer in the box so the processor (ECM) can be sent to the company for a reflash. If the ECM isn't reflashed, severe engine damage will occur and the warranty will be voided. We disconnected the battery, removed the ECM, and sent it back via the Next-Day FedEx box supplied. Roush returns the processor by Next-Day FedEx. Here's our ECM, ready to be reinstalled.