sorry to read about your problems with the JB4!
I have the JB4 w/Bluetooth and EWG cable on my A91 06/20 production and didn’t have this problem.
Only complaint I have is the support from Burger is very slow and lack of feed back with log reviews.
I spoke the Boostlogic guys this past weekend @TX2K about this exhaust bc I have the non-valved version and according to Boostlogic the valves will only reduce the pops and burble duration. Honestly this exhaust is insane when it comes to sound! I freakin love it on cold starts and warm startups...
I can’t stand all of these online stores without a contact phone number. I’ll shop elsewhere and pay a little more knowing you could reach them by phone.