Originally Posted by felixthecat
I'd install the header & get your exhaust figured out, while using the regular fuel, then when a 1/4 tank or less, I fill it w/ premiun & Flash it, & then enjoy the punch & smoothness of the motor.
By "flash it" you mean tune it? Or what exactly do you mean? (Car terminology newb)
SES038 - SR225 - Focus Owner Since December 20, 2010
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