That's right!
It began by the ECU but once all parts are installed, we will remake an ECU update.

I sent an email to "Fi-exhaust" and I got a response very quickly. He tells me 5 and 10% gain, which seems really huge. I asked to see a power curve, but it does not. A strange thing is that for 550/560/570, there is an X-pipe system, but not for the 500/520/530 models. I will like to know why.

I will be really happy if "Fi-exhaust" could intervene on this post!