Amazing they are back on tour already. They've stopped through a nearby GA airport on and off over the years and their loop takes them over our house. I remember one morning being woken up by the sound of the B-17's four Wright Cyclones, looking out and seeing it come over the backyard. Another time, I starting hearing the radials and then the B-24 came into view. I found myself jumping up and down like a little kid.
Those 2600s with short stacks on the B-25 are LOUD. I've always found the two-engine B-25 to be louder than the four-engine B-17s or B-24s. The TBM Avenger uses the same Wright 2600 motor. Not only is it loud, but it shakes the tarmac if you're lucky enough to stand reasonably close to one while idling. The funny thing was that after one TBM flight where I had brought my Sprite to the airport, the little 1275 was making the same bumpity-bumpity cadence as the 2600. It was like the little kid trying to imitate its much bigger brother!