No haven't done a dyno run yet. But, I am sure you would hear it standing right in front of the car...lol...fun! But, having them on almost a week I noticed the deeper growl at high rpm and under a load. Pretty cool. Like two big deep horns.
Tonight, we put on the stillen exhaust!!!! Pretty big difference. I think quiet at idle. No real drone or tainting of exhaust sound. It just sounds I think more manly. And then at high rpm it sounds mean. It lets the car make the sound.
Lol... thinking I am pretty happy at this point!! And oh yes by the way the exhaust is like one millimeter from the black crossbar of the subframe or I don't really know what it's called. Part of the car... so yeah it rattles against it a little. I will definitely have to tweak it somehow!! BUT, when it is not hitting it, it sound very smooth.
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2010 aluminum 370Z coupe sport 
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