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Discussion Starter #1
Just purchased my '02 duramax and I purchased an extended warranty with it. My question is what, if any, performance upgrades can void that warranty?
 

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All and every, but being realistic I would say you could slide a exhaust system, air intake system, a box of your choice and a fuel system(FASS or a pump not dual cp3's) through pretty easy at most dealerships.
 
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