Can anybody identity this UFO - from underneath of K11

[CMF_micrafun2]

Few days ago, this part has dropped from the bottom of car.

Can anybody identify it, say what function is and is it critical - do I need to fit it back

 

[CMF_Juzzy]

It's not the cat heat shield is it?

 

[CMF_Rudy]

Juzzy WROTE:

"It's not the cat heat shield is it?

yep, one less rattle now

 

[CMF_micrafun2]

Thanks guys.
I can see the drawing now.
I dont think its critical to fit back? Is it

 

[CMF_RBLUV]

No