IndianStang

Hey folks.. I run borla atak cat backs on my '16 GT auto, I've driven just 2000 km, initially the transmission had an aggressive downshift and in sport mode the exhaust note was sweet as it auto blipped the throttle, but I was away for 10 days during which the car wasn't used and now the transmission seems to have lost the aggression, it just doesn't seem to be downshifting, and I no longer hear the throttle blip... any one have a clue what's happening here...