I have the HKS Super Turbo (single muffler one) part number HKS-31029-AT003 and AA catted downpipe. Normal mode it runs a little louder than stock and sport mode is deep tone and sound pretty good imo. No drones either. And the exhaust tips look good too.
Yea, I tried with the local dealership when it first happened. The problem was it happened intermittently so the dealership couldnāt duplicate the symptom. Hopefully it is a software issue like you said and the update got pushed to all dealership to install to our car.
Mine does the same, not very often though. It did it intermittently in the first 1500 miles and went away until lately it started happening again (3600 miles). Iām curious to see what we find out and if thereās a fix for it.
I have a brand new jb4 just didnāt have a chance to install it yet, so...