Bro in tuning they open the above of engine, and as you know that they check and clean the essential parts. Then they do throttle body cleaning with wipes. They have pretty good mechanics, they take care of everything. I don know exactly what else they do, but they do accelerate the car few times in the whole process. And YES when they are done ask you to check the pedal and accelerate and you really feel the diff, the car seems very light and the pick up is great. But i think that was because my spark plugs, oil, and filters were changed with new ones.
In brake service they take out all the wheels, disks and some other stuff, they check it all out. They also clean pads and other stuff. Then they adjust your hand brake and front brakes. I felt a slight diff in my brakes after that, but the hand brake just became as hard as a new car. Know my car stops even on a hilly slope on the first or at max on the second 'tak'.
