Originals: 5(based on the price to value ratio)
SAI: 9(because of the "value added" markup, would be a 10 if they were the same $$ as Kirkham)
Kirkham: 10
SPF: 9
FFR: 1-9 depending on the build
ERA: 1(about as nice as a Duramax)
IMHO, anything can be a 10 if the price is right.
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.disclaimer: ERA rating is for Turk's benefit only