are these good? or how bout TR8ix Iridium?

Any one? i need to buy new spark plugs so are these any good? and how much do i need to gap them to

Those plugs are fine and I believe the gap is .060. But you can double check it by looking at the placard under the hood.

whats the difference of a tr8 and a tr8 iridium

iridium's will last 100K miles and cost quite abit more then the TR8s.

Is it worth it though

Hello,

Iridiums are a long lasting plug. Not a performance plug in a SC'd engine.
If you want a long lasting plug the Iridium is worth the money. If you are concerned about your track times, and change your plugs on a regular basis, Copper is the way to go.
Iridiums last a long time, but have a tendancy of burning hotter, creating detonation under the right circumstances.
Coppers don't last so long, but have better cooling attributes reducing the possibility of detonation.

Later now,
Clint

since i don't have any mods, i just put the factory plugs back in the car. i figured the factory ones lasted 100k and still looked good, that putting the same ones back in was the way to go. i know that whatever i got from the dealer, they were not cheap!

I too kept the same type plug and I spent about 40 bucks for the six of em.