I love the noise of my intake and exhaust, especially when its cold, there not too loud I as still have the OEM votex back box on and the intake is wrapped in heat reflective tape. At higher speeds its still fairly hushed even at high revs, on the inside anway, good balance of noise and refinement.
The 'raw' mechanical edge they bring is nice, letting you hear the turbo spool and deeper exhaust note, with very mild pop/bangs on overrun, otherwise its just a boring , refined, in-line 4 noise.
Still have memories of driving a 360 and Murcielago at full chat on a track, different sounds but both amazing, and my cousin's NASCAR-like Pontiac Firebird Trans-Am WS6 with a stainless exhaust, ****** amazing.
In the future when everything's electric, or some kind of turbine driven hybrid, we won't have any such music, so lets enjoy while we can.