Spark plugs - different models effect power

[kpop]

going to do a service on my v6 vz calais next week - spark plugs, oil filter, fuel filter and air filter

now ive read alot about different spark plugs, but essentially, what will be the difference between the $6 each and $20 each versions - how exactly will they effect my car, thanks.

[Peter B - CV8]

On a bog standard car you won't notice any real difference. However, the normal (ie cheaper) plugs will need changing every 20,000 k's - whereas the more expensive plugs are supposed to be good for up to 80,000.
It really comes down to how often you want to change plugs.... the rear ones can be a real pain to get at.

[kpop]

thanks for clearing that up for me mate appreciate it