I haven't done it myself but I read it in the newest 5.0 Mustang. I think you may gain maybe a tenth but 4 tenths is pretty optimistic.
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'97 Laser Red GT Coupe
Stock 2V (Pulled Silencer)
4R70W Automatic
Ripped off a BLISTERING 15.37@90MPH
With a 2.21 60ft
Just Installed- K&N Air Filter
Coming Soon......
-4.10's
-Flowmaster A/T or Magnapack Cat-Back
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