I had these GSC 280/ 272 cams installed on my 9 and did a before and after dyno.

These cams made an extra 8.2kw atw @ 7000rpm and looks just over 10kw @ 5600rpm. The power gain is above 3200rpm and below it has dropped abit.

This is without any adjustable cam gears or tune. The car is now running richer, so I will need to get it retuned, and hopefully will get at least another 5kw from it.

Below is the before and after dyno.