PERFORMANCE SPARK PLUG Harley Davidson FLSTF Softail Fat Boy EFI (2008-2007) * GFRT712BR14ZCYU801 Reviewhttp://tinyurl.com/lvqtfvd PERFORMANCE SPARK PLUG Harley Davidson FLSTF Softail Fat Boy EFI (2008-2007) * GFRT712BR14ZCYU801 1. Higher HP and torque by up to 3 %2. increased economy by up to 5%3. 360� Firing Technology4. Improved acceleration by up to 15 %5. 25,000 miles - 40,000 km duration
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