Bought the stage 2 for my 2012 VW Jetta 2.0l S sedan. Followed the instructions which was just turn the key to Accessory for 10 seconds then start the car. I'm extremely pleased to say this is the real deal! I immediately noticed 25-30hp difference, idle is like a brand new car (perfection), and even on my manual I feel a huge difference in shifting gears! Very smooth like butter! So for these fake reviews they either didn't follow instructions or are trash... I 100% recommend this product! I actually told all of my family and friends they need to buy one! I do have a performance exhaust and cold air intake added to my car before I bought this. But its awesome to say the least!