Pfr6b-9 is pre-gapped to .9mm

Pfr6b is pre-gapped to .8mm

Performance difference is 0.

Your more likely to find pfr6b than pfr6b-9 on the shelf at general auto shops.

I used to do the pfr6b's for $15.00 a plug for club members - sorry I don't have wholesale access to them anymore since i changed jobs.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]