I had a predator zorst on one of my xbr's, it was on the bike when I bought it. Personally I didn't rate it, it was very heavy and the pinch bolt from the link pipe to the silencer kept coming loose. No matter what I tried it would still vibrate loose. Spent half my time on the garage floor nipping the damn thing up. I then had the one made that I popped on the cafe racer 😢😢. Full stainless system, custom made to my design and still only cost £400 ... happy daze. Oh and it sounded much better too😉🤘
Cheers.. Michael