At first I always that the sound that you are talking about was just mainly from cars running small turbos. I could barely hear the turbine howl on my 2.2 with 3 inch exhaust, no cats, no mufflers with a T3/T4 60 trim. I just assumed that I couldnt hear mine because the turbo was kind of big. But our shop cars have nice size turbos and you can easily hear the turbine howl...
You can hear the howl of one our shop cars....twin turbo 2003 Cobra with two GT35Rs, 3inch downpipes, with the cut-outs open
http://videos.streetfire.net/search/hpp/0/wm/ef20691a-c6ca-4373-9030-98770170b36b.htm
You can kind of hear the howl/scream of our other shop car... 1999 Cobra with a 88mm turbo and 5 inch exhaust dumped right past the front lower control arm.
http://videos.streetfire.net/search/manny/0/wm/4186ee11-0f91-4ce7-91c3-5b35ac4306c3.htm
275hp & 306tq - 1999 2.2 ohv
13.2 @ 108 mph
-1996 2.4 liter + Turbo + Built motor + Torco + More boost = Lots o' Power
-2000 Mustang GT + 2004 Cobra motor, Whipple 2.3 supercharger,
built rear-end,Dodge Viper spec T56 6 speed, bolt-ons = wheelies at the track!!!!!