Hi, I have the 1.6. From my own experience driving a 2.0L WRX getting a cpu flash was like getting a new scary car. About a 50hp increase felt insane with intake and exhaust. My research for the 1.6 hasn't been very promising as far as HP increase. The limiting factor is the CVT is good for only 250lbs of TQ. But a good tune will definitely make for more of a fun drive. Absolutely need to upgrade the J pipe to get the benefits. Most results show a 35-50hp increase depending on mods. Which you really only need the high flow cat jpipe, upgraded intercooler makes a huge difference and simple drop in K&N filter. The tune will give better throttle response (like we want) and uncork the boost at the top end of the RPM range. Where currently the stock map basically shuts the turbo off. I'm sure you notice it. When the turbo kicks in you getting a little punch and then all of sudden it trails off like someone is pushing against the car. Fixing that part alone will make the driving experience sooo much better. So in summary, upgrading with a tune is definitely worth the driving experience but be realistic as far gains goes.