Not Ranked
I have raced all of my Cobras and the coupe and I have the IRS in the Coupe and it is great. I had a straight rear end in the Roadster and it worked well also. I am not sure about the Factored Five IRS, but the one in mine is a very good unit.
And if you like the idea of building the car from the start, then there are several that are good and I think Factory Five is as good as any of them. The final result will be as good as the person building it and many change things from the original kit anyway.
Ron
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