1. Ferrari 360 CS hands down coolest noise of all time
2. Mod motor Mustangs. 5.0 or 4.6 it doesn't matter. Oh and slap on a centrifugal blower... hotter than hot.
3. BMW M3 CSL
4. Morgan Aero8 GTN
5. McMerc SLR
well I haven't really heard much in person and certainly nothing exotic but among my favorites are g35 coupe, vw r32, pretty much any subaru with a decent exhaust. v8's are of course cool too but I can't pick certain ones out. Now from hearing videos and stuff definitelly have to say ferrari 360 CS.