There is a bit of cam hickup at idle but nothing stellar...will pass for stock to the untrained ear.
Torque increase is noticeable while driving for sure...especially on the low end, if you look at the graph around 3500rpm there is a bump of about 20ft/lbs; as most daily driving is done from 1000-4000rpm its a nice addition.
I'd expect gains to be larger with a set of proper headers but the goal of this test was to put them in a 'typical street z' and see what they would do... that being said this car still has factory headers, which are shorties.
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