Definitely anti-lags.
It was designed to have boost off corners and for launches. As usual, douche bags use it in the most useless way… Coasting to a stop.
One idiot around the way I guess finishes from work around 10PM and has to let everyone know. His car sound like those 50 gal rectangular thrash containers if they were to get ran over/ roll over.
Body on frame car is very old (80’s).
Since then cars are unibody which means the frame part is integrated and spread across the body and floor parts.
Manufacturers have moved on to subframes. A strong U or boxshaped tube rail to fasten powertrain mounts, steering, suspension arm and all moving parts onto. They then bolt the subframe to the unibody with dampers and bushings to reduce NVH into the cabin.
For soundproofing, most windshields now have 2 panes with glue sandwiched between the 2, the pillars are filled with foam, door panels and the floor have strategically placed thick sheets of sound dampening,
As for smoothness, lots of cars have different suspension to do the job. The standard is the multi-link suspension( many control arm with different range of rotation and angles that together keep the wheel flat on the surface if you accelerate, Brake, corner) having as many arms as possible helps the ride stay smooth and quiet.