I am guessing that BMW should be a 12.50 car or so and by the way the trucks pulls on it I am guess that the truck is a 11.70-90 truck. But who knows if what they say in the video about what is done to them is true or not.
I know, I would be pissed if my 50k car didnt run 11.80 stock as well. It was good thing I only paid half that for mine. But then again it makes me laugh buying a 20k "sports car" with a v8 that will barely get out of the 14's with mods..
Minus the brakes all those other things you listed are helping you go faster. I am just amazed on what people have in their car and what is runs. My fd I plan on having less the 10k total in the whole car and it will be a single digit runner. The TBSS should have maybe 3k in it depending if I add some efans and a few other things and it will be a low 11 truck. If you do your homework you can find what works best with your car and make is run really good for alot less.
Cars run their best when they are stock. You already got a race car, why make another. I would put that money into the stang to make any improvements, if any, to make it go faster.