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View Full Version : Bosch Platinum +4 spark plugs


wav399
12-30-2001, 07:44 PM
Sorry about that mixed up title on the taillight switcheroo.  Now, about spark plugs, do Bosch platinum +4 plugs make a positively effective increase in performance for a N/A 93 S13?  I've read that it does not for the turbos but how about N/A cars? I'm about to get them installed tomorrow.