Exhaust Pop
 

I'm noticing an persistant issue with my automatic FR-S. This happens mostly when the engine is cold and set in sport. I hit that accelerator from stopped or rolling start and in between the shift from 1st to second there is often a exhaust pop noise, similar to but not as loud as a back fire. The shift is also very rough comparable to other shifts from 2nd to 3rd etc.

Has anyone else noticed anything similar?

Car is stock.

DI collar failure, if happening under load (pressing the skinny pedal).