Ok heres is what scc had to say on the topic

There is some controversy about the pulleys, as they are not equipped with the harmonic balancer that the stock pulley has. We feel the risk of removing the balancer on certain engines is not really a risk. Inline, four-cylinder engines for the most part have short, stiff crankshafts. These do not need a balancer as much, because of their high natural frequency. Engines with long, whip-like cranks, like inline six-cylinders, need balancers to prevent failure, but most four cylinders do fine without them.

http://www.sportcompactcarweb.com/pr...scc_proj200sx/

 

... You don't hafta click that to see that has nothing to do with an Acura or a Honda.

Just because they're talking about an inline four doesn't mean they're talking about our inline fours.