Update: For the last week, I was focused on Gas Mileage. On the weekend, I took out the chip to see if I could feel the difference. Yes I did. First, without the chip, the car felt like a glove. Feedback with throttle, steering and handling was fully in my control. Perhaps, what Kia intended. Now with chip back in, when stepping on the throttle, I didn't know what to expect.....when boost would kick in for example. In the end, I could feel a difference with chip back in....in regards to acceleration and boost. For the last 5 days, I still didn't feel that I could hang with my former 2015 Optima SX Turbo. I started having thoughts of stop trying to make a 2.0 feel like more than it was. Just enjoy the superior handling, rear wheel drive, Sunroof Harmon Kardon system and good looks. Well today, I hit another break-in period. I could remember my Optima had hit it around 3k and 5k miles. I was not sure if I could feel or would get another break-in boost with the chip. Question answered! At 2,470 miles on the odometer....it hit big time. Acceleration, throttle response all increased considerably compared to my drive to work this morning It is nasty now! Grin was back on my face. I'm quite sure I'm around 300 hp and estimate I can run mid 5 second 0 to 60 times. My former Optima is now beat. Wow.....i can't wait for the last brake-in. Qtr mile track time and Dyno later this Spring.