The only thing I found was this via a google search.
http://www.mpd-inc.net/buickregalgs.htm You can go to
http://www.pfyc.com/c/RG/ to get more parts for your car.
Correct regarding the PCM reprogramming. It is not required but highly recommended as the car will still run. Just not as efficient as it could.
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GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
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