You do not need one to lower your car. I lowered mine and did not need one. Some people do however. If you are going to buy a panhard spend the extra and get an adjustable one. Jack is lowered without an adjustable panhard. If you do lower you will need Lowere Control Arm Relocation brackets or traction will suffer severely. As always
http://www.bmrfabrication.com..... If you go to say 315's in the rear then the adjustable will probably be needed to fit them evenly in the rear wheel wells...
PS... I'll be in Georgia in February.. We gotta hook up....