I bought an mbrp can for my 2009 m8. I have an slp y pipe and pipe, just switching out the can for better sound but it seems to not fit up with the mbrp can very good.There is a lot of gap on the back side causing an exhaust leak.Is the can and the pipe incompatable or did I get a crookedly welded up can?Is anyone running the same setup or will I have to switch back to the factory pipe if I want to run that mbrp can?