I've had NST Pulleys on for over a year 10k+ mi, and have had zero problems.
Dyno feel doesn't really change, but I do notice the fact that the engine revs much faster and smoother... Like there's 'less' of a strain to do so. Granted changes are minute and can be attributed to seeing what you want to see, but it's noticeable to me.
The primary concern comes down to how they're installed. If they are installed correctly by a competent technician, then you'll be fine. If not, then you'll have problems. So trust your mechanic or don't get them.
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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14
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