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I never saw the thread on this subject, but I'd be hesitant to yank the balance shafts out of the QR if your car is a daily driver that you envision yourself driving a few years down the road. Unless your Altima is an all-out drag car, why take the risk of watching your engine vibrate its way out of the bay at 6000 rpm for a few horsepower?
The QR is a big, highly undersquare four cylinder with an 89 mm bore and a 100 mm (!) stroke. Such a design inherently lends itself to wicked second-order vibrations, which is why Nissan decided to equip it with two balance shafts, a first in its U.S. lineup. Removing them initially may not hurt anything other than the fillings in your teeth, but as the miles pile up the added vibration will be tough on journals, bearings and the like. Not good, methinks.
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