At some point I will upgrade the lower control arms. Is it worth getting adjustable control arms? If so why?

I do not do drag racing, occasionally I will do a track day.

My main goal is a daily driver that is a very fast road car that can go round corners.

Also what about the lca relocation brackets?

 

What do you want changed/fixed with your suspension? How long have you had your car? I suggest you drive it for 6-12 months, enjoy it, and get to know its handling characteristics like you know the back of your hand.

I love my lca relocation brackets. I added them after lowering my car and rear traction was much better.

I'm going to work on fixing/upgrading/adjusting bump steer and camber/caster alignment stuff first before I decide if I want/need control arm upgrades. If I do upgrade control arms I would go with adjustable since it's not much more $$ than non adjustable, but this isn't my first mustang so I know what I want and what I like and don't like.

You frequently ask if upgrade x or upgrade y is worth it, it's only worth it if you want it like it need it.

 

Also, keep learning about suspension and asking questions like you're doing, and then someday when you notice some behavior in a corner you'll already know what caused it and/or how to fix/improve it. Suspension is a personal preference thing, Ford sells them to please the majority of drivers, you, me and Paul down the street will upgrade or cars differently.

 

Have a look at this diagram of lca bracket location:

http://unclenard.com/Pics/Mustang/Fo..._Explained.png

 

IMO go with adjustable so that you can square the rear suspension up if you plan to lower the car, and if you plan to lower the car depending on how low you may require relo brackets.