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I had a HKS HIper exhaust before and I like it more then the Greddy I have now. It's not any louder then the Greddy. I can feel the HP gain. I can spin the tires even with the VSC on.
I had the HKS Hiper for awhile, but it was too loud for my taste. Compared to the Greddy, the dB levels are about the same, but compared to the L-Tuned, RMM, and Borla, it's much much louder.