I have the HKS cat back. It is very quiet compared to Honda standards The turbo helps to keep exhaust levels to an acceptable level, even with a straight through muffler design. It also looks stock, so noboddy has any idea what you've got under the hood... just my style
The HKS sounds nice. Not loud at all. As far as other options. There isnt much out there compared to other cars like hondas and dsm's, but there's enough to help you get by and anything else you need can be custom done.
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