Well the full-race exhaust is an amazing piece(wish they would make one for the s2000). it is very quiet while cruising around. That is mainly due to the fact that the exhaust has a huge resonator along with the muffler. The berk has no resonator at all so it will be louder.

I considered a berk exhaust, but with a resonator welded in. Berk will do this themselves before shipping if you ask. Of course they will charge a little more. Glad i went hks in the end though.