also it might sound different just because its dual in dual out? not too sure...

 

heres one with a 5.3. no idea on his setup, its a youtube special.
volant cold air intake with spintech exhaust - YouTube


here another, its dumped, but it sounds more like mine with the pipes to the tips. guess its all about camera quality and angle.
spintech exhaust on my silverado - YouTube

idle doesnt sound right on this one, but rev up does. it could be my ears or mines just different.
Spintech Exhaust - YouTube