The round "bolts" are covers - remove the covers with a flat screwdriver and the bolts come off with 8MM sockets.but the stock hose clamps are round for some reason. I used a set of extractors for rounded bolts to get them off.
I jacked up the car with a hydraulic jack where the owners' manual tells you to and put wheel ramps under the front tires and then let the car back down on the wheel ramps. Car is too low to drive up the ramps. That gave me enough room to R&R the hot pipe.