Mustang II suspension

PoisonDart74 said

Stock k-member, reinforced, is plenty of metal for whatever you want to throw at it.

These aftermarket jobs are for if your bored and want to change something just to change something.

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Not necessarily. They will free up a ton of space for headers....and allow you to run a rear sump pan without having to fight with the centerlink. Or better yet, allow you to run a dragster style flat bottomed oil pan....