maybe he just figured you had a flowmaster in it as well. 
never heard a 400hp 5.0L with glasspacks, have ya?
it has a rather distinctive, and telling idle.......throttle it at all, and well........it'll make the hair on your arms stand up. throttle it in gear, and it'll draw most of the local law enforcement in earshot.
on a side note, i was moving the camaro the other day. one of my friends from CAP that lives about 1/4 a mile away from the shop stopped in to see what i was doing to it.
