Oops my bad, for some reason I thought you were asking the hanger bolts. Sorry. Yes the flange (smile) bolts are pressed in. Just have the shop torch it and knock it off so you have a hole for the replacement bolts. Can't remember if the bolt is on the muffler pipe or on the mid pipe. If the bolt on the mid pipe, you will have to take your car to the shop to get the rusted bolt torched off. Minds as well have them do the whole job while you there to save the trouble and hassle working under. Its pretty tough to break those rusted nuts loose when you laying on your back under the car.