Not Ranked
I called Roush prior to buying mine and asked why the numbers differed so much on the dyno sheets and why they were not all the same. They replied depending on air temp, humidity etc there will be a variance. This is the first I have heard of a 434R, I wonder if they are all 434R but they now call them 427's because 427's is a notorious number. Either way I am thrilled with mine.
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