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Bob,
Check out the dieselplace.com You will find a wealth of information regarding intakes, exhaust, chips, and programmers. Some members have never had a problem with any of the modifications while others have had nothing but problems. Having a family member who is linked in with GM, I can say that many dealerships are not honoring warranty work or willing to work on vehicles with the types of modifications you mentioned. Just check with your local servicing dealership to get their official stance on service and warranty work with modifications before you proceed.
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