I installed them on my old 370z, when I was full bolt on. With the crank & alternator kit from NST, I had no issues at all and was definitely noticeable. Revs much quicker. Power comes lot quicker and smoother.
Also in regards to the harmonic balancing. I had Nissan install mine. And they said there is no problem and doesn't void warranty. Harmonic balancing is in older cars. Most newer cars like 370z are internally balanced not just by the crankshaft / pulley just have to make sure it's installed perfectly straight and it won't be a problem. I'd find a new shop. I had mine installed for $75 by a friend at Nissan. And never had one issue with power, A/C or any other accessories not running properly, I loved mine and recommend them to anyone who wants to do the mod!
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