The best engines
 

For me, it would have to be the Monaro. I remember seeing one on Top Gear and the noise was simply awesome.

I'll take the DB9, the sound of that V12 gives me shivers. Or the Masser GT, Italian V8 at it's best. You can keep the two cylinder Fiat, I drove one and it sounded like a pizza delivery moped haha.

I'd go with the sound of the 365GT/B4 V12. I got to spend an afternoon running Willow Springs in a Formula Ford while one of them was also running. Even better was once driving through Houston with a stock version, perfect exhaust system to make it sing.