No idea other than to jack it up and check all the connections. Never had a problem with any of mine. How you like the car so far? There is a facebook page for Roush owners and an owners group,
Roush Road Crew that has meets and events.
Side note: You list the car as 575 hp which is a Phase I, not 2, their at 625hp.
Thanks! Love the car! Yeah...I need to change the HP...just installed Phase 2.
Take a look under the butt-end of the car and see if the mufflers look the same on both sides . . . other than that, I have no clue.