Most quiet exhaust setup
The Best V8 Stories One Small Block at Time
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There's a link in my sig to it. SLP Dual/Dual AND a bullet in the I-pipe. People laugh their *** off when they hear it, but STFU when I open the cutout.

Here's a clip, it's quieter than it seems in the video. Just take how loud the damn starter sounds compared to the exhaust for comparison.
http://media.putfile.com/TheBlurLS1s-exhaust-232007
BTW - Just to give you an idea, I've made back to back runs at the track with the cutout open/closed, and the times were identical. SLP dual/dual flows great.
you may as well just put a tennis ball in the Y-pipe. 
You grow out of the ***** to the wall loudness after a while. I like to keep 'em nice and cocky right before I hammer their ***.






