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On the airdam, more flow will be seen by removing an area as wide as the slot down to the ridge. Use your choice of weapons--a jigsaw blade or a sharp utility knife will do the job, but a die grinder with a cutoff wheel works best--to cut a rectangular chunk out of the plastic as seen here.
LS-1 F-Body - Take the Money & Run

 On the airdam, more flow will be seen by removing an area as wide as the slot down to the ridge. Use your choice of weapons--a jigsaw blade or a sharp utility knife will do the job, but a die grinder with a cutoff wheel works best--to cut a rectangular chunk out of the plastic as seen here.  View Related Article

 

 

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