I've read people saying that di daw sya bagay sa japanese cars. I forgot the logic behind it.
Better stick with NGK na lang. Go for the GP (platinum) if you want to "upgrade".
based on experience walang noticeable gain sa hp pati sa fuel economy(lumakas pa yata konsumo ng 1.3 Toyota XE ko noon-carb.)......imho stick with stock plugs lalo na kung daily driver lang...