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I was amazed when I joined here and saw open posting about no cats and tuning. Those topics have been off limits in the online Mustang world for years. The EPA's view is that touching any part connected to the motor is illegal tampering of emissions device. Real world talking to localish shop owners is that as long as you leave the cats and PCV on you're a low priority. Those shop owners also report what are clearly EPA fishing calls asking if you will remove cats or tune a car that they gutted the cats on. The local diesel shops won't touch tampering with a 10 foot pole, the Feds don't play one bit on that.
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