Magnecor Competition Spark Plug Wires for 90-05 Miata

Magnecor's KV85 Competition (8.5mm) Ignition Cables feature Magnecor's exclusive 2.5mm high capacity Metallic Inductance EMI Suppressed conductor consisting of stainless steel wire precisely wound at 200 turns per inch over a ferrimagnetic core. The insulating jacket is made entirely of Magnecor's exclusive TC-1500-HS high strength aerospace grade silicone rubber, and its single layer construction will prolong the jacket's insulating ability by conducting extreme heat away from hot-spots that occur near over-the-limit heat sources.

The KV85 8.5mm jacket has a service heat resistance of 600 degrees F (320 degrees C) and up to 1,000 degrees F (540 degrees C) for short burst 3 minutes. 

Even if limits are exceeded, the silicone rubber will retain its insulating ability until wires are removed from engine.

Magnecor Race Wires are primarily designed and constructed to be used in applications where it is essential to prevent the possibility of ignition wires compromising engine performance. Modern race engines, modified street engines and stock street engines which rely on electronic devices to control the function of either or both the ignition and fuel systems are prone to interference from all other spiral conductor ignition wires sold through performance parts outlets, none of which can provide proper suppression for EMI, particularly if a high-output ignition system is used.

We always recommend use of Magnecor Race Wires for any stock or modified Miata.   We have never seen a set fail.  They seem to last forever.  In fact, they come with a limited lifetime warranty.  This should be the last set of wires you'll ever need.