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Don't know about GMPP but with Warranty Direct if you have engine mods, replace the exhaust or change radios it voids the warranty.
Any excuse to get out of paying a claim. With warranty direct you can't do your own maintenance either. Everything must be done and documented by a certified mechanic. Proof of oil changes by a cert mechanic are required every 4000 miles or 3 months whichever comes first otherwise the warranty is void.