I just did the muffler delete last week and had the tips custom welded back on and sometimes usually when I am getting on it I can smell gas. I mentioned it to my buddy and he said it means its running rich. I asked the shop before hand if it could have any negative impact and they said no it will just change the sound. So if it is causing a rich condition (which would suck...) then I will go have the muffler put back on.
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