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I myself have used nothing buy NGK Vpowers.

<img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />
I run V-powers in everything i owned in the last 15years w/no problems. I change them every 20K mi, They don't wear that bad for me.
Specialized part number repository
The sparkplugs recommended for any of the mitsu motors are listed here w/discriptions. <img src="/forums/images/graemlins/kewl.gif" alt="" />