Preignition

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=Zqz8AdJMxTY

Comparing the Motorcraft SP 534 (heat range 6) to the Motorcraft SP542 (heat range 7) and noting the effect on preigntion on a tuned 3.5 Ecoboost.

3.5 Ecoboost, Ecoboost, Gearhead, GHTuning, EcoBoost Tuning, Heat Range, NGK Plugs
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