NGK PFR 7B

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14 February 2010, 12:54 PM

ESSEX_BOYZ_DAN

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NGK PFR 7B

would you say these are the best plugs for MY03 STI....

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14 February 2010, 01:58 PM

Norman Dog

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I was recommended them by Andy Forrest before he remapped my car.

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14 February 2010, 03:16 PM

JohnD

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If your car is pretty standard, you'll see little benefit over the standard fit PFR6G, however, they offer a margin of safety if you are running higher boost along with other mods. Use 0.65-0.70 gap

JohnD

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14 February 2010, 05:46 PM

pete.wilson

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I assume 6 are hotter, if are running them and they aren't white then they are fine, if they're covered in a fine white powered then you need cooler plugs as they are over heating. The issue with running too cold a plug are if you do lots of starting/stopping, they will foul up and you will have starting issues.

HTH Pete