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1991 5.0 ECU Upgrade?

Discussion in '1989 - 1997 Ford Thunderbird' started by BigxN8, Feb 12, 2019.

  1. I'm planning to put on a new throttle body and a new exhaust system on my 5.0. I have heard that without a performance chip, my car may run worse. But I also know that this car is from 1991, so would these upgrades hurt my performance and make it slower or would I need to get a chip to make it run properly?
     
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