New trucks don't sound like old cars - why?

Not trying to start a fight, and all respect to you owners of awesome modern mopar trucks.

When I hear a modern Ram with a 360 take off at a traffic light, it doesn't have that awesome sound like even a mild 273 or 318 from back in the day. And the same goes for V8s by the other brands.

Why is that? Towing cams? Modern exhaust? Magnums are different? I can speculate, but anyone know the real reason? OR do they really sound the same and I'm biased?