1970something Posted October 21, 2014 Share Posted October 21, 2014 Hey Everyone, About a month ago I went stage 2 on my 2005 GT: CNT catted downpipe 2013 STi up-pipe Road tune by JohnJohn at Outback (infront?) Automotive Now whenever I get off the freeway the cabin starts to smell strongly like sulfur/rotten eggs. Do new HFCs have a break-in period where they smell like ass? Or did I buy a DP with a bad cat? Any thoughts? Link to comment Share on other sites More sharing options...
benena Posted October 21, 2014 Share Posted October 21, 2014 sulfur? maybe it was just the area you were in. Link to comment Share on other sites More sharing options...
chato Posted October 21, 2014 Share Posted October 21, 2014 i'd guess you have am exhaust leak at your DP/catback connection. I've never been able to get mine to seal correctly after the 3 inch DP. Link to comment Share on other sites More sharing options...
Holla Posted October 21, 2014 Share Posted October 21, 2014 My car will occasionally drop a bomb. I have the same CNT downpipe, maybe it has someone to do with the cat. It's seems to have gotten better over time, I've been running the pipe for over 3 years now. If you're smelling something everyday you probably have a different issue. Mine only smells bad maybe once everything other week now. It's usually under full load conditions with low rpms that I smell it. Like if I have it floored in 5th gear at 2,500 rpms. Link to comment Share on other sites More sharing options...
1970something Posted October 21, 2014 Author Share Posted October 21, 2014 The first few times I assumed it was one of the cars around me, but it has happened enough times, on multiple gas tanks, that I'm pretty sure it's me. Link to comment Share on other sites More sharing options...
MrTris Posted October 21, 2014 Share Posted October 21, 2014 Mine is always on-boost, but I know I have an UP leak. It's not your tune, it's probably the gaskets. Did you use a new donut gasket when you installed the DP? Link to comment Share on other sites More sharing options...
quick4dr Posted October 21, 2014 Share Posted October 21, 2014 if it is a constant smell you have a leak somewhere. check manifold to up-pipe, up-pipe to turbo, turbo to downpipe, and DP to catback. if you drive with only 1 window open it will pull a syphon and suck the smell into the car. Link to comment Share on other sites More sharing options...
1970something Posted October 22, 2014 Author Share Posted October 22, 2014 New gaskets were used at every interface when the parts were installed. I suspect its the 3"-2.5" adapter that's leaking. I'll check all of the joints this weekend. Thanks for the help everyone! Link to comment Share on other sites More sharing options...
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