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I don't think they will give you a problem with just removing the muffler. The exhaust doesn't really have an effect on the injectors. Obviously, there is no way of telling what the dealership will say until you take it in and it is too late. Injectors have been an issue with the 01s for quite some time...that's why they went to the 7yr/200,000 mile injector warranty.
 
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