Nope, horsepower as well. The V6 turbos of the 80's.
I was at Montreal this year with my son and it great knowing I didn't have to worry about hearing damage. Past engines were just painful to the point of absurdity.
The V6 turbos of the 80s sounded good, in stark contrast to the raspy blowdryers we have now, but that debate has already been going on for 2 years in the thread devoted to engine sound.
As a counterpoint, I didn't go to Montreal this year for the first time since 1998 (not counting the canceled race in '09) and that choice was influenced in no small part by how utterly uninspiring these current engines are.