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Lots of threads on this. Think slightly better (aka louder, raspier than RSRs) but not as far off the original as Supercups. Buy 'em, love 'em - unless your looking for something louder!
I had a set of the origina Fabspeeds and they had an awfull resonance at about 2800. I was told this was later designed out of the them. Do yours resonate at all?
Maybe a little, but nothing significant. I hate to say no because I might just be missing it. I sure hear it from some of the ricers I drive around though.