i was stage 2 with stock catback for over a month while i was too cheap to spend $1000 for $26.28 worth of rolled and polished steel pipes. eventually i caved because i wanted to hear some boxer rumble. 2013 sedan.
seat of the pants power difference between stage2 Invidia 3" DP + stock catback and the same stage 2 Invidia DP + 3" Invidia catback? zip zero nada. its all sound no perceivable difference in POWA lol.
EDIT: i have the Q300. there is absolutely 0 drone. doesnt matter if your cruising at 45 or 85. its almost too quiet to be honest. but for a daily driver for anyone out of their teenage years its perfect