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Ford Crown Victoria/Mercury Grand Marquis Modifications
Hello to all! Totally new to all this. I own a 2005 Crown Vic P74. I recently had it tuned by SCT (computer flash Excal 2)and it runs really strong. I currently have single exhaust. I want to have duals put on it with Flowmasters. If I do this, does anyone know if it will throw the computer off and make it run like crap. ">