What year is your Mustang? Headers are always a worthwhile modification-especially considering the restrictive stock manifolds. I would definately install them if you already have the rest of exhaust completed.
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Todd
1995 GT/T-5
Pulleys; 65 mm TB; Flowmaster cat-back; Mac off road H-pipe; FMS aluminum driveshaft; short-throw shifter; HD clutch; Cobra R's; Cobra front and wing
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