a couple of quick Answers..
1-TORSION BAR SIZE
i like my cars to be on the stiffer side
depending on the car SWB or LWB
I LIKE THE FOLLOWING SET UPS
A -22-28 MM T-BAR
B-22-30 MM
C 23-31 MM
all depends on final purpose & level of ride quality you can live with
2-MUSIC..
grew up a headbanger into Heavy metal.
mellowed slightly into hard rock -outlaw country-
currently NOT listening to much music...
NO STERO WORKING IN ANY CAR......
WELL THE execption is my just finished 66 sunroof 911!!!