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UMI Performance driveshaft safety loops are NHRA-legal bolt-in applications for 1982-87 GM G-bodies. UMI Performance driveshaft safety loops are a must for tracks requiring safety loops for cars running faster than 13.99 in the quarter-mile. The loops are entirely constructed from 0.250 in. thick mild steel, have CNC-machined mounting points for a superb fit, and are fully MIG-welded for outstanding strength.