Anybody cryo treating spark plugs with positive results?

 

^ Might as well just buy the Iridium plugs instead of buying copper and paying to have them cryo'd. The most it will do is potentially make the copper plugs last longer.

 

At what hp range should you change from heat range 8 to heat range 9?

 

I ran the copper plugs for a while car ran like crap when cold and had electrical interference running iridium's no problem

 

When I had my 150 shot nitrous setup I ran the ngk v powers 2 steps colder then stock. LOVED them, copper will melt/vaporize (happened while being tuned). Iridium well that shit breaks off and plays dynamite inside your engine. Or so I've heard