I have the TRS Race for my F4, and it sounds really good. It is not loud when cruising, but just enough note when you get on it. I thought the zyclone would just be too quiet. I have the stainless pipe.
The triangular shape really looks good against the bike in my opinion, too.
I am not sure how the RS-3 sounds compared, but I imagine it is close to the same. Just thought I would let you know!