exhaust tone???

On my way into work this morning, a late 80's mustang pulls next to me (i was driving my crappy dailey driver, 84 chevy p.u.).
nice frigin car, cowled hood, nice lumpy idle, no chrome or spoiler, narrowed rear end, very very nice car.
he pulls away and I hear this real low kinda tinny sounding exhaust. I've heard it before, but always on highly modified cars..
sweet sound!!!!
his exhaust was cut off under the car so i couldn't see the diameter.. but what gives that sound?? is it just the way a high perf motor sounds or ?????

thx...

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Black,84 GT,ground effects,shorty headers, 'open' dual exh.,302 HO(no pollution control crap),T5,89 ported heads,edelbrock Performer manifold, Edelbrock 2122 cam,600 Holley, high volume oil pump...

Some day (3:73 gears & N2O)!!!

will this ever end????