The Nismo is a beautiful and extremely will designed exhaust system that I myself would buy. Does it perform well? I'm sure it does, but I don't know for sure because I haven't seen any numbers yet. But since you're asking about other brands and because I haven't seen numbers on the Nismo I can't really recommend it. But I can say that the JBA is proven, and will be about $600 less then that Nismo.