Not Ranked
I would highly advise not changing. My SPF Daytona had the 427R and it was a pain to drive in the city. It stumbled in traffic and did not like anything but WOT. My GT40 MK11 had the 427SR and was much easier to drive daily. I really could tell little difference at WOT from the 427r
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SPF Daytona coupe 055, Roush 427R
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