Thanks for the feedbacks on your experiences guys, even though you're using a different solution
I also was really surprised with the results as I felt the same as you!
A flatter power curve, a small loss below 2000rpm, but a solid gain between 2000 and 4000, and still better breathing after.
You can see here:
https://www.youtube.com/watch?v=i6wD-U7kONc that I'm always in second gear, between 3 and 4500rpm, and the car doesn't lack power despite having 117 000miles! No problem initiating a drift either!
I want to start selling them, but I really believe that you NEED supporting mods to get results.
Mavis, Madmodz, any update on yours ?
Ben