Scud owners with Fabspeed headers/cats

I am contemplating putting Fabspeed headers and sport cats on my Scud and was hoping to get feedback from other owners on the board that have done this, specifically my questions/concerns are:
- Is there a real noticeable performance difference?
- What is the sound like, especially at highway speeds where I don't want it to be obnoxious, which happened when I installed a Tubi NGT exhaust on my Stradale. I like loud at WOT but not on the highway.
- Did it reduce the heat in the engine compartment? As most of you know the CF can get discolored due to heat issues and my cars gets new panel this month.
- If you did the expensive ECU upgrade with the headers/cats and was it worth it?
- Was the installation fairly seamless or did you have problems?

Thanks for your feedback!!