Hello, I have a 2015 Type R with 100k miles (woohoo!)

I’ve noticed a sound recently when going over bumps.. there’s something that sounds like loose change or keys, possibly a loose bolt coming from the left tire area.

nothing seems poor about the ride quality, but curious if this rings a bell for anyone.

 

The active exhaust vacuum pump is behind and inboard of the left rear tire, you might take a look to see if anything's loose. But no, your description doesn't sound familiar.

 

Did you check for loose change? Sorry could help myself It could be a loose connector for the wheel well liner.

 

hm, that sounds like a really good assumption. There’s actually a slight buzz sound from the left side exhaust too.

 

Could be any of those, or maybe some loose baffles in the exhaust. I get exactly the sound you describe on start up when the tickover revs are higher, and the noise fades when the revs drop off. Don't hear it thereafter

 

Did you ever get this sorted out?
I get this exact same sound going over speed bumps. Sounds like a handful of loose bolts rattling around in the rear of the vehicle but only when going over significant bumps and no other suspension issues or noises.