I've had the Circuit Werks Anti-version model for a long time before switching to ART pipes. The circuit werks definitely helps in removing or keeping the rasp down. I had it with my Top Speed exhaust and also Motordyne exhaust on my G37. I sold it to a guy who has it with muffler deletes and the video he sent me, I didn't hear any rasp.
I also had it for about a year and the welds all still looked good when I removed it. The flex area were fine also.
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RHM 75mm TB & ported up/low mani., 3" intakes/velocity stack, Z1 Headers, Motordyne ART pipes, HBP 3.5" exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, Bell Raceworks diff brace
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