Weird noise when letting off acceleration

[Muffin1]

I have this. It’s done it for the last 80,000km.. it’s the muffler. When you let off the accelerator I believe the engine cuts the fuel and it’s just a deceleration drone through the exhaust.

I believe that's what I'm experiencing, it's just to coincidental that i noticed this shortly after a Magnaflow muffler install, i will monitor if it gets louder without a corresponding exhaust tone increase under acceleration
( i notice it decelerating from about 65 to 60 )

Sponsored

 

[Jmarler]

So my half shaft was bad and it was the source of the leak. Confused on how that happened. They replaced the differential carrier a month ago. I don't know much about vehicles. Anyone an expert in this?