I am not one that does a lot of modding but I had a cat back true dual on the z well before I hit 700 miles. I don't see any reason you need to wait (Couldn't stand the rasp of the stock exhaust). Some say wait and that may be the best answer but dealerships will either warranty your stuff or be a PIA. That has more to do with the dealership than the mods you do to a vehicle.
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