Quote:
Originally Posted by Fruits of Labor
My first mod will be, to add the Borla S type Catback exhaust. Dealer would not do it claiming, "That system was not approved by GM." 
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I had the dealer order and install the LLT exhaust upgrade, and got told after it was installed that the GM performance parts are not approved by GM

and it has the possibility of voiding my warranty. Not sure what GM approves but your dealer is more then likely not sure as to what is approved and what is not.