glass pack and and muscle car sound

On my 360 with 273 manifolds, I have a 2 1/2" dual exhaust with no crossover run straight out the back through a pair of El cheapo brand X glass packs. It has a real nice sound at idle, but what amazes me, it the fact that the faster I go, the quieter it gets. There is no drone thought the entire rpm range that I drive. I know that from the exhaust tips to the manifolds, this system is 100% wrong as far as performance is concerned. As soon as my piggy bank gets a little fatter, or i win the lottery, my plan is to get a set of TTI's with a crossover pipe and a set of thrush welded mufflers. Maybe I can uncork a few of those ponies in the 360.