I just bumped into a guy at a Honda dealer with a new 1098 sr4 duc with the arrow full exhaust with the double carbon fiber canisters
He started it for me and let say this, way too loud..
I was thinking of one for my S3 but it's too loud for me..
I think it is only for the track.
he said you can't add any tips at the end to help quiet them down either.
Take into account the SR4 is a 4 valve L twin which has a completely different sound than the S3. The S3 has less cyclinder displacement per cyclinder so it probably isnt going to be as loud on an S3.