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I asked a service tech. at Crevier BMW if I would void the warranty on my 2008 M3 if I changed the exhaust, and I was told that the warranty would NOT be void is the exhaust was a bolt on after market application from the CAT back. Also the new exhaust would NOT tap into any of the factory wiring harness (don't know exactly what that part means, but though I would post that part was well).
I would check with your local BMW service department to verify.
Probably wouldn't hurt to let the dealer install the exhaust as well.
Hope this helps.
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1931 Ford Model A Chopped 8" The Green Grenade 1965 Shelby GT350 1966 Shelby GT350
1966 Shelby GT350 w/ Paxton Supercharger
1967 Corvette 427/400 HP Roadster
1968 Shelby GT500KR 1997 Ford Cobra Bondurant School Car
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