Just went and checked on FI's site and it looks like the mod is for 12+ models as something changed with the coolant crossover pipe that doesn't allow the driver's side header to bolt up.
Quote:
Originally Posted by AlWakRa
Also, you will need either a 20 guage wires to extend the pre cat sensor wires or an extension link, as motordyne will not provide them.
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When I did headers the first time on my Cobra I had to do the same thing. Wasn't a fan of it and would rather run extenders if they exist. If not, I might just make some myself.
Thank you for the heads up on the wiring i'll make sure to have something ready before I start if I go with the Motordynes.