I have never heard the HKS, but I do have the TRD one, and it sounds nice, its not obnoxiously loud but when you step on it you will hear it, trust me, and at cruising speeds you can tell its there but its not overpowering, but if you want to add a header and all that good stuff then go with something else, TRD only sounds good stock. I'm going to replace mine once I save up some money. Hope this helped.
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