05_Snoozaru Posted April 22 Share Posted April 22 Getting a situation where when I have my sunroof open, and I accelerate I’m smelling exhaust. If my sunroof is closed, there is no smell. That leads me to believe I have a leak somewhere. Any recommendations on how to troubleshoot this? Could this be a gasket/flange issue? Or maybe a bad cat? I have a catted upipe that I will be replacing with a Grimmspeed soon. Let me know thoughts! Link to comment Share on other sites More sharing options...
relative4 Posted April 22 Share Posted April 22 Put it on ramps, get under there, and have a friend rev it. 1 Link to comment Share on other sites More sharing options...
JmP6889928 Posted April 22 Share Posted April 22 Check UP on both ends, especially if it's an aftermarket UP. If it's a Grimmspeed, look for the flex joint to be bad underneath the mesh. Usually if you open the sunroof and it pulls it in, it's right at the PS of the engine, and that's a common failure point. If it's just gaskets, then you're lucky and easily fixed. 1 Link to comment Share on other sites More sharing options...
relative4 Posted April 22 Share Posted April 22 A lightly used OEM STi up pipe is better and cheaper than the Grimmspeed. 1 Link to comment Share on other sites More sharing options...
05_Snoozaru Posted April 22 Author Share Posted April 22 Thanks for the replies guys. Will dig into it this weekend! Link to comment Share on other sites More sharing options...
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