After installing my UPR x-pipe on my 98, I found out that it doesn't fit right! I thought the gasket on the passenger side was leaking but it turns out that the flange on the x-pipe itself does not mate up to the exhaust manifold outlet, after I bottom the nuts on the studs, there is a gap on the left side of the flange where exhaust is leaking. I have tried adjusting the x-pipe to get the passenger side flange to sit right but there is still a gap, it's almost like they welded the flange crooked and that one side of the flange is hitting the exhaust manifold first and not letting the rest mate up. Has anyone else had this problem? Can anyone offer any advice other than selling it and getting another brand?

 

Call UPR. They are usually pretty good with things. I have a BBK O/R X Pipe that I will sell you for $50 plus shipping. It came off of my old 98 GT. Its loud as fvck though lol. Email me if your interested eddienstewart@yahoo.com

 

https://mustangforums.com/m_2576897/tm.htm

Good luck!!! I just went through the same crap...

 

Does it kinda resemble my issues ? https://mustangforums.com/m_2571917/tm.htm