I am using a chip (Superchip Flip-Chip, custom burned & dyno tuned) to retard my timing 4 degrees.

Currently I am running with NGK TR6's.
I believe VenomSVT is also running them.
They seem to work great.
7 weeks of running nitrous and the plugs are still about 95% shiny.

Frank McCoy aka Mod-deth aka Mid Life Crisis aka SVT Doood aka mcgainer is a SCAM ARTIST Pre98 Zetec - Some Mods