I have a Chevy Stepside 75, Stroker 383, Comp Cams cams, Dart heads, 3" exhaust, X-Pipe, 500hp. I started. with cheap Thrush silencers, too loaded, huge amounts of "hate the neighbors". I immediately switched them to Flowmasters, not only was the crockery and cutlery in my house and my neighbors' house vibrating, it also seems to have permanently damaged my hearing. Seriously, I had ringing in my ears for a week after a few test runs. I didn't get what the guys meant by "empty rumble," but nowβ¦