I don't have any sound clips but with a 975 rpm idle it is almost like stock. I am running 2.5 inch exhaust with cutouts no cats and flowmaster 40's dumped at the rear axle. Very loud. I will try to get you a sound clip.
HVY SS

 

thanks, id really like to hear it on an impela so I can show him.

 

i have the 503 in my Z28 and love it, sounds awsome!
http://www.baycityrides.com/media/95Zburnout1.wmv
this is through a single in single out 3 inch flowmaster.

 

you can probably still hear it in my sig. that was with a stock cat tho..it sounds much crisper with a highflo