Review on LEDAUT Black 8 Cyl Spark Plug Heat Protector Insulating Fire Sleeve For Enhanced Spark Plug Wire Protection by David Merculief

Only time will tell if these really do their job. Quality seems good.They're a little tricky to get over 90 degree plug boots, but if you work at it you can get them. I managed to get them over my MSD 8.5mm wires.The only complaint I have is the spark plug end has a small opening because there is a metal ring inside the boot. I discovered it's like a spring type ring (think cheap keychain ring). If you are careful you can stick a pair of needle nose pliers in it and force them open to expand the ring a bit.