I would recommend having the car loaded and in its natural position. The guy who welded my steeda subs on lifted my car up and set it back down on blocks about 2 feet tall and then welded them in.
When a car is on a lift, it could be slightly twisted and not straight as it is when it's sitting on the tires. The unibodies are prone to that, as I'm sure you know.
As to your other question, I don't know anybody who has MAC subframes, I have the Steeda's w/x-braces and I am very happy. It made a huge difference in my car.
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