I had it, it sounds really ,,,,,, good. ( or bad, depends on the taste, it is a high pitch whistle )
I got rid of it because my car suffered poort gas milage ( like it is going to make much different with my set up ) and jerkyness between shifts ( my girlfriend hates it so bad she refused to get into my car )
there is this one post about the hks exhaust, you can hear the HKS ssqv in the short video.
quality wise is great, also a great engine dress up mod.