4 Way Compatible with NC Miata MX-5 Rear Oxygen Sensor ExtensionExtends the rear oxygen sensor electrical connection to Bank 1 Sensor 2 Downstream oxygen sensor. Allows use of the stock oxygen sensor when a race catalytic converter or RoadsterSport Max Power racing header is installed. If you require a custom length extension please let us know. This is standard length of ~49" electrically.Made here at our US facility in Richmond, Virginia with Tefzel wire construction, high temperature, flexible fiberglass based sleeving, and crimp tooling performed with quality OEM tools.Specific to compatible with Mazda vehicles, not for other platforms.ApplicationsCompatible with Mazda MX-5