I've been quoted approx $1000 to install by the Maserati dealer.
My take is that it's not much louder than stock, but sounds better. Larger diameter pipes and it deletes the mufflers (which don't do much anyway)
I’ve heard both and I have the Capristo. It does sound better but not that much better. I wish I could control the valves to open them when desired. The gold tips with black shrouds look great and fill out the holes much better.