I've been using the FelPro job with the "firering", never any problems, even on my 14 to 1 engine. Summit & Jegs both have them.
2012 F-150 XLT SC Ecoboost Tuxedo Black, 6.5' bed, 4x4, 3.55s, SSI tunes, 4" Flo-Pro exhaust with Twister resonator
I can do all things through Christ who strengthens me. Phillipians 4:13
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