While Magnuson Moss was a great help to aftermarket performance suppliers in general, it is WAY to vague to offer much help when a S/C or Turbo upgrade is installed. If you have a drivetrain problem following a HP upgrade of 50-75% & GM denies coverage, just fix it on your own dime. You don't have enough lawyers to frighten GM, & they have a pretty solid argument to deny warranty repairs anyway.
Now, if after you install the S/C, or Turbo the wiper motor fails & they deny warranty coverage, you've got a case.
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