No. It Will Void The Warranty As It Applies To Whatever Item You Have Modified, ie They Will Not Fix Your Magnaflow Muffler If A Weld Comes Loose, But Legally Cannot Effect Coverage Of Any Other Part On The Car. I Believe It Is
SEMA That Has Fought For This Protection, As They Have An Interest In You Modifying Your Car.
BTW: I'm A Magnaflow Dealer And Have Installed A Few. Good Choice. MAKE SURE You Go With An All Mandrel Bent System. Do Not Settle For Typical Corner Muffler Shop Crush Bends.