My Aero rumbles nicely on overrun when tickling along slowly in traffic, which I like. But I'm not a fan of pops and bangs though, it always feels like somethings going to go sometime soon.
My first +8 in 1979 had a straight through system, I remember drilling out the two silencer baffles and knocking them out. That made a big improvement in it's sound, with a good bark on the go and rumbles on overrun.
