I was hoping to avoid those guys. It took them 4 visits to fix a loose axle nut. On the first visit when I mentioned the noise it was making they said "two of the guys that work in the shop drive an FR-S and they said it's the exhaust and it's normal." This was after I had already suggested it was the axle nut and if not, worst case a cracked part in the diff that some people have had.
I'm afraid if I take the car in to order the part (which is about $8 online from dealers that sell OEM bits and bobbles) they will charge me $37.99 and try to add muffler bearings to my order
But I may swing by anyways. If they pick the same part I think it is and charge me < $10 I'll feel ok.