Rick

What's the issue with this plug at high power levels? is it reliabily (ie melting electrodes) or missfire problems?

Rick.

abdr500

iTrader: (1)

its more heat range and melting point

Billabong

As above, if heat range is wrong for the engine, then the tips melt, which could = disaster.

They're a good plug when used in the right application.

Turbo lag

I think Stage three is the most they can do, anymore and you risk the tip melting off and scrapping your engine
I would avoid and try the Ford apr 701's



Dave.

PS These are RS turbo plugs and cost less than a tenner, as recommended by Mike Rainbum.