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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by TimJ:
That would be great to put on my rig!!

How does a supercharger affect your warranty from GM? </div></BLOCKQUOTE>

If the SC is not a factory (GM) authorized addition to the vehicle, chances are the entire powertrain (engine/trans/TC, axles, etc.) will be voided; other parts of the warranty such as A/C, radio, steering, etc., should not be affected.
They do have to relate the addition of the SC to the failed part. It can get pretty tricky, but from the manufacturers point of view, this is not an authorized item, and it could cause undue stress to parts of the engine.
If it is an authorized GM SC, and installed by a trained technician, than the warranty is not affected.