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Changing the muffler wouldn't really affect the warranty(except for the warranty on the muffer itself) because BMW needs to prove the modification caused the problem(when a problem arises) in order to say it isn't covered under warranty. How could a better flowing muffler cause an engine problem?
I would use Dinan only for modifications that are considered "higher risk" if you are concerned about the warranty.
Edit: I was just saying that u shouldnt buy Dinan only because you want the warranty
Last edited by Ryan@Motorwerks; 04-26-2006 at 07:42 PM..
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