I just had a Ls-V put together about a month ago, lately I have been smelling a strong gasoline/exhaust smell coming threw my car. I'm running type R headers and 3 inch straight pipe, I just checked to find out that I don't have a 02 sensor and the bung isn't plugged, Could this be the problem? just trouble shooting to see if I can fix the problem. Any ideas and help would be very appreciated.

 

Since you know the bung is unplugged, try plugging it and see if the problem goes away.

 

hmm, huge exhaust leak might be a problem