Why did the ZLT11 get an engine sound change?

Why does it sound like a loud leaf blower now? What was the reason for that change? The original engine sound for it seemed fine to me. In fact, it now shares the engine sound as the MBT-2000.

Again, I’m really curious on why the sound change. I can understand the MBT-2000 sounding like that, but not the ZLT11. Just seems like a nerf to the vehicle overall.