The panhard bar centers the chassis over the rear axles.
You only need an adjustable one if you change the ride height of the car (lower it) because your chassis will be an inch or two off center to one side or another. Stock height doe not need this adjustable part.
So if you lower your car you need this part otherwise it does nothing for you over the stock panhard bar.
KB 2.4 IC, KB Stage 2, Level 10 tranny, Kooks 1.75" LT, Powerhouse, FRRP, Moroso, M/T, AFCO, Autometer, Hot Rod Chassis, ST Motorsports, Moroso, Granatelli Motor Sports, Simpson
11.42@ 118.98 MPH 1.63 60'