Buy Subaru STI Spark Plug Wire (Cord). Cable Complete. NO.4. Spark Plug (High Tension). Spark Plug - OEM Subaru Part # 22451AA420 (22451AA400)

-17 #4. 18- #4 E / #426865. Spark Plug Wire.

CABLE COMPLETE-HIGH TENSION,NO.4 Spark Plug Wire

Fits Legacy

Spark Plug Wire Set
Spark plug wires in your Subaru STI carry electricity from the distributor or ignition coil to your spark plugs. Old and failed wires can short out causing anything from hesitation and bucking to excessive interference in your radio.