I recent had the Ferrari Racing style exhaust installed on my 2004 360 and couldn't be happier. My though were in line with your. I didn't want a LOUD exhaust, just something a bit more oomph and that's exactly what I got. The best description I can give is it's a bit throatier at idle and very similar to stock at cruise, but has that beautiful sound I was looking for when those valves open up! And y es, it came with updated ECUs and a small heat shield for the back lid as this exhaust generates more heat. Don't be fooled by the "Racing" moniker. This is not a window rattler and doesn't bother the driver on long excursions, at least not this driver. Perfect upgrade for me.