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I talked to a guy locally that runs performance shop exclusively for mustangs. Going with after market headers will only gain you a few hp and that's for the long tube and they are hard to get in. Better off getting a Bassani Xpipe with cats along, a good cat back, 373 gears, and it you can afford it a Procharger. There is very little performance difference with or without cats so save yourself a headache.
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