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when does a rear race wing help. i have a 83 bubble back capri and tends to get loose on the top end of the track. 1/8 and 1/4. runs 5.80 in the 1/8 at 121 and low 9 in 1/4 at 145 plus. thinking about putting mustang hatch on with a alu. wing. also leaving the capri bumper on and do not want a strut style of wing on. any help would be great.