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Which class are you running in, or is there a particular class you would like to stay in? A lot of what you could do will be determined on that.
Good tires and a front sway bar are always good places to start when setting up any car. Sway bars are fairly cheap and help reduce body roll a bunch.I'm not really familiar with Mustangs, hopefully someone else can give you some insight.
Yes I was... I was in the blue BMW 135i. I also took the pics posted on here.