$1500-2000......................
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I am not going to say what is best, but I put a Nova clip in my 51 Ford pickup and it cost me next to nothing. Maybe, I got lucky that it didn't need any ball joints or anything. I did replace the idler arm .

Point is, do what you can best afford............Me, I am not the type to sink alot of money into my cars.

Also, I feel that the M11 setup is for lighter duty cars...........a full size Chevy or a pickup truck is a lot heavier than the Mustang.....just my opinion.