Your Side Attacks can do more than shake your car and
help you hit enemies...they can also help you 
turn with expert precision. To make a sharp right turn,
you would push to the right on your control stick 
while at the same time pressing R + R twice fast. To 
make a sharp left turn, you would to the left on your
control stick while at the same time pressing Z + Z 
twice fast. 

This technique works especially well on tracks such
"Big Blue 2: Quick Turn" and "Mute City 2: Technique".