This is a "HR PARTS N STUFF DRIVE SHAFT LOOP" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. NHRA requires a drive shaft loop on cars running 13.99 or quicker with slicks, or 13.00 with street tires and are a good idea on just about every performance car out there. This heavy duty Driveshaft-loop comes with the much preferred round design, and exceeds the NHRA requirements with a thicker 5/16" wall main ring/tube.This is for added protection at higher power and speeds, since we name brand 1/4" wall rings have been known to fail. These loops are built with either laser cut or CNC machined mounting plates for a perfect fit, welded all the way around each plate. Each loop is sand blasted and cleaned before the Powdercoat finish, and is available in black.