As I recall, the 336/337 WAS substantially noisier than most twins. When I was (a lot) younger, a 337 used to operate around the Leavesden/Luton area, and you could hear it coming for ages (and hear it going for a similar period too.
Similar sound was the old Piaggio twin pusher..... did the noise have something to do with pusher props then ????
I did have the pleasure of flying one from New Jersey to Rhode Island & back (with diversion along the Hudson river to see NY) back in the 80s though. Great fun, lots of power, and not as noisy inside as outside. The takeoff routine was: open up on the rear engine first (to avoid FOD from the front engine propwash) and get moving before you open the front up. Once the second engine came in, it really accelerated.....