100% agree and was just sharing a data point that I thought was impressive as it's with four cats and everyone on the internetz always parrots that you have to take cats out to make power.
No shoes for our e-brake, it uses the rotor pads. You have to make sure the e-brake isn't on and use something like Bimmerlink to unwind the rear e-brake motor.
Titanium is not stronger than steel. Yes by weight a lighter Ti stud will be closer to the strength of a heavier 10.9 steel stud but not stronger. You also should not use an impact with Ti. Steel is harder.
for street/show cars, sure thing