loud bang during down shifting

[jolly green giant]

'15 GSA, while coming to a stop down shifting from 2nd to 1st using GSAP heard an unusually load bang, not the usual popping sound. This happened a couple of weeks ago.

Yesterday on pushing engine start on N the same bang from the airbox area.

Anyone experienced this anomaly?

 

[Phill Elston]

I've got a full Akro system. Normal for mine if I've been hanging of the right hand grip...

 

[Nice 'n' Fat]

I've occasionally gone from 1st to 2nd using GSAP but never 2nd to 1st and I will definitely not be trying it anytime soon

 

[GBH]

I have used the GSAP between any of the 6 gears with no problem and for me the best shift is 2nd to 1st works great and sounds nice.