Review on Optimize Your Hyundai Sonata's Performance with the Revolutionary Chip/Power Programmer - Compatible with 1.6L, 2.0L, 2.4L, 2.5L, 2.7L, 3.0L, and 3.3L Engines - Enhance Fuel Efficiency, Save Gas, Boost MPG, and Amplify Horsepower and Torque! by Ryan Bowers

Very disappointed with the product as it did not have detailed step by step instructions with pictures as stated in the description. Instead, I had to email the correct installation instructions to accompany the product and wait for a response. Also, their website is missing the correct installation instructions. As far as performance goes, time will tell and I'll update this review with my impressions in a few months. I hope their product performs better than the people who wrote the product description!